5c820c168d
Follow-up to [60936]. See #43258. Built from https://develop.svn.wordpress.org/trunk@60944 git-svn-id: http://core.svn.wordpress.org/trunk@60280 1a063a9b-81f0-0310-95a4-ce76da25c4cd
967 lines
30 KiB
PHP
967 lines
30 KiB
PHP
<?php
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/**
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* Template loading functions.
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*
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* @package WordPress
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* @subpackage Template
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*/
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/**
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* Retrieves path to a template.
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*
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* Used to quickly retrieve the path of a template without including the file
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* extension. It will also check the parent theme, if the file exists, with
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* the use of locate_template(). Allows for more generic template location
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* without the use of the other get_*_template() functions.
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*
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* @since 1.5.0
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*
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* @param string $type Filename without extension.
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* @param string[] $templates An optional list of template candidates.
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* @return string Full path to template file.
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*/
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function get_query_template( $type, $templates = array() ) {
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$type = preg_replace( '|[^a-z0-9-]+|', '', $type );
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if ( empty( $templates ) ) {
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$templates = array( "{$type}.php" );
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}
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/**
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* Filters the list of template filenames that are searched for when retrieving a template to use.
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*
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* The dynamic portion of the hook name, `$type`, refers to the filename -- minus the file
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* extension and any non-alphanumeric characters delimiting words -- of the file to load.
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* The last element in the array should always be the fallback template for this query type.
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*
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* Possible hook names include:
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*
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* - `404_template_hierarchy`
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* - `archive_template_hierarchy`
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* - `attachment_template_hierarchy`
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* - `author_template_hierarchy`
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* - `category_template_hierarchy`
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* - `date_template_hierarchy`
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* - `embed_template_hierarchy`
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* - `frontpage_template_hierarchy`
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* - `home_template_hierarchy`
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* - `index_template_hierarchy`
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* - `page_template_hierarchy`
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* - `paged_template_hierarchy`
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* - `privacypolicy_template_hierarchy`
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* - `search_template_hierarchy`
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* - `single_template_hierarchy`
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* - `singular_template_hierarchy`
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* - `tag_template_hierarchy`
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* - `taxonomy_template_hierarchy`
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*
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* @since 4.7.0
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*
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* @param string[] $templates A list of template candidates, in descending order of priority.
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*/
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$templates = apply_filters( "{$type}_template_hierarchy", $templates );
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$template = locate_template( $templates );
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$template = locate_block_template( $template, $type, $templates );
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/**
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* Filters the path of the queried template by type.
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*
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* The dynamic portion of the hook name, `$type`, refers to the filename -- minus the file
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* extension and any non-alphanumeric characters delimiting words -- of the file to load.
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* This hook also applies to various types of files loaded as part of the Template Hierarchy.
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*
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* Possible hook names include:
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*
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* - `404_template`
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* - `archive_template`
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* - `attachment_template`
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* - `author_template`
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* - `category_template`
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* - `date_template`
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* - `embed_template`
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* - `frontpage_template`
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* - `home_template`
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* - `index_template`
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* - `page_template`
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* - `paged_template`
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* - `privacypolicy_template`
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* - `search_template`
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* - `single_template`
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* - `singular_template`
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* - `tag_template`
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* - `taxonomy_template`
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*
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* @since 1.5.0
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* @since 4.8.0 The `$type` and `$templates` parameters were added.
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*
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* @param string $template Path to the template. See locate_template().
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* @param string $type Sanitized filename without extension.
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* @param string[] $templates A list of template candidates, in descending order of priority.
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*/
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return apply_filters( "{$type}_template", $template, $type, $templates );
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}
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/**
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* Retrieves path of index template in current or parent template.
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*
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* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
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* and {@see '$type_template'} dynamic hooks, where `$type` is 'index'.
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*
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* @since 3.0.0
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*
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* @see get_query_template()
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*
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* @return string Full path to index template file.
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*/
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function get_index_template() {
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return get_query_template( 'index' );
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}
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/**
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* Retrieves path of 404 template in current or parent template.
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*
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* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
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* and {@see '$type_template'} dynamic hooks, where `$type` is '404'.
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*
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* @since 1.5.0
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*
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* @see get_query_template()
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*
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* @return string Full path to 404 template file.
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*/
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function get_404_template() {
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return get_query_template( '404' );
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}
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/**
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* Retrieves path of archive template in current or parent template.
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*
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* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
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* and {@see '$type_template'} dynamic hooks, where `$type` is 'archive'.
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*
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* @since 1.5.0
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*
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* @see get_query_template()
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*
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* @return string Full path to archive template file.
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*/
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function get_archive_template() {
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$post_types = array_filter( (array) get_query_var( 'post_type' ) );
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$templates = array();
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if ( count( $post_types ) === 1 ) {
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$post_type = reset( $post_types );
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$templates[] = "archive-{$post_type}.php";
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}
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$templates[] = 'archive.php';
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return get_query_template( 'archive', $templates );
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}
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/**
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* Retrieves path of post type archive template in current or parent template.
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*
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* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
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* and {@see '$type_template'} dynamic hooks, where `$type` is 'archive'.
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*
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* @since 3.7.0
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*
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* @see get_archive_template()
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*
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* @return string Full path to archive template file.
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*/
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function get_post_type_archive_template() {
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$post_type = get_query_var( 'post_type' );
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if ( is_array( $post_type ) ) {
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$post_type = reset( $post_type );
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}
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$obj = get_post_type_object( $post_type );
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if ( ! ( $obj instanceof WP_Post_Type ) || ! $obj->has_archive ) {
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return '';
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}
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return get_archive_template();
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}
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/**
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* Retrieves path of author template in current or parent template.
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*
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* The hierarchy for this template looks like:
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*
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* 1. author-{nicename}.php
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* 2. author-{id}.php
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* 3. author.php
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*
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* An example of this is:
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*
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* 1. author-john.php
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* 2. author-1.php
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* 3. author.php
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*
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* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
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* and {@see '$type_template'} dynamic hooks, where `$type` is 'author'.
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*
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* @since 1.5.0
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*
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* @see get_query_template()
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*
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* @return string Full path to author template file.
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*/
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function get_author_template() {
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$author = get_queried_object();
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$templates = array();
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if ( $author instanceof WP_User ) {
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$templates[] = "author-{$author->user_nicename}.php";
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$templates[] = "author-{$author->ID}.php";
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}
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$templates[] = 'author.php';
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return get_query_template( 'author', $templates );
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}
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/**
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* Retrieves path of category template in current or parent template.
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*
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* The hierarchy for this template looks like:
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*
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* 1. category-{slug}.php
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* 2. category-{id}.php
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* 3. category.php
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*
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* An example of this is:
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*
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* 1. category-news.php
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* 2. category-2.php
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* 3. category.php
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*
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* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
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* and {@see '$type_template'} dynamic hooks, where `$type` is 'category'.
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*
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* @since 1.5.0
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* @since 4.7.0 The decoded form of `category-{slug}.php` was added to the top of the
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* template hierarchy when the category slug contains multibyte characters.
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*
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* @see get_query_template()
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*
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* @return string Full path to category template file.
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*/
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function get_category_template() {
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$category = get_queried_object();
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$templates = array();
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if ( ! empty( $category->slug ) ) {
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$slug_decoded = urldecode( $category->slug );
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if ( $slug_decoded !== $category->slug ) {
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$templates[] = "category-{$slug_decoded}.php";
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}
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$templates[] = "category-{$category->slug}.php";
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$templates[] = "category-{$category->term_id}.php";
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}
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$templates[] = 'category.php';
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return get_query_template( 'category', $templates );
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}
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/**
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* Retrieves path of tag template in current or parent template.
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*
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* The hierarchy for this template looks like:
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*
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* 1. tag-{slug}.php
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* 2. tag-{id}.php
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* 3. tag.php
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*
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* An example of this is:
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*
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* 1. tag-wordpress.php
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* 2. tag-3.php
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* 3. tag.php
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*
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* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
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* and {@see '$type_template'} dynamic hooks, where `$type` is 'tag'.
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*
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* @since 2.3.0
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* @since 4.7.0 The decoded form of `tag-{slug}.php` was added to the top of the
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* template hierarchy when the tag slug contains multibyte characters.
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*
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* @see get_query_template()
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*
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* @return string Full path to tag template file.
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*/
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function get_tag_template() {
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$tag = get_queried_object();
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$templates = array();
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if ( ! empty( $tag->slug ) ) {
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$slug_decoded = urldecode( $tag->slug );
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if ( $slug_decoded !== $tag->slug ) {
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$templates[] = "tag-{$slug_decoded}.php";
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}
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$templates[] = "tag-{$tag->slug}.php";
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$templates[] = "tag-{$tag->term_id}.php";
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}
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$templates[] = 'tag.php';
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return get_query_template( 'tag', $templates );
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}
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/**
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* Retrieves path of custom taxonomy term template in current or parent template.
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*
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* The hierarchy for this template looks like:
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*
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* 1. taxonomy-{taxonomy_slug}-{term_slug}.php
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* 2. taxonomy-{taxonomy_slug}.php
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* 3. taxonomy.php
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*
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* An example of this is:
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*
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* 1. taxonomy-location-texas.php
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* 2. taxonomy-location.php
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* 3. taxonomy.php
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*
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* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
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* and {@see '$type_template'} dynamic hooks, where `$type` is 'taxonomy'.
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*
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* @since 2.5.0
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* @since 4.7.0 The decoded form of `taxonomy-{taxonomy_slug}-{term_slug}.php` was added to the top of the
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* template hierarchy when the term slug contains multibyte characters.
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*
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* @see get_query_template()
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*
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* @return string Full path to custom taxonomy term template file.
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*/
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function get_taxonomy_template() {
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$term = get_queried_object();
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$templates = array();
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if ( ! empty( $term->slug ) ) {
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$taxonomy = $term->taxonomy;
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$slug_decoded = urldecode( $term->slug );
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if ( $slug_decoded !== $term->slug ) {
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$templates[] = "taxonomy-$taxonomy-{$slug_decoded}.php";
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}
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$templates[] = "taxonomy-$taxonomy-{$term->slug}.php";
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$templates[] = "taxonomy-$taxonomy.php";
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}
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$templates[] = 'taxonomy.php';
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return get_query_template( 'taxonomy', $templates );
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}
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/**
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* Retrieves path of date template in current or parent template.
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*
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* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
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* and {@see '$type_template'} dynamic hooks, where `$type` is 'date'.
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*
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* @since 1.5.0
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*
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* @see get_query_template()
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*
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* @return string Full path to date template file.
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*/
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function get_date_template() {
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return get_query_template( 'date' );
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}
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/**
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* Retrieves path of home template in current or parent template.
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*
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* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
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* and {@see '$type_template'} dynamic hooks, where `$type` is 'home'.
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*
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* @since 1.5.0
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*
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* @see get_query_template()
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*
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* @return string Full path to home template file.
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*/
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function get_home_template() {
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$templates = array( 'home.php', 'index.php' );
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return get_query_template( 'home', $templates );
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}
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/**
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* Retrieves path of front page template in current or parent template.
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*
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* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
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* and {@see '$type_template'} dynamic hooks, where `$type` is 'frontpage'.
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*
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* @since 3.0.0
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*
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* @see get_query_template()
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*
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* @return string Full path to front page template file.
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*/
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function get_front_page_template() {
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$templates = array( 'front-page.php' );
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return get_query_template( 'frontpage', $templates );
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}
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/**
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* Retrieves path of Privacy Policy page template in current or parent template.
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*
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* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
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* and {@see '$type_template'} dynamic hooks, where `$type` is 'privacypolicy'.
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*
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* @since 5.2.0
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*
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* @see get_query_template()
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*
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* @return string Full path to privacy policy template file.
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*/
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function get_privacy_policy_template() {
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$templates = array( 'privacy-policy.php' );
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return get_query_template( 'privacypolicy', $templates );
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}
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/**
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* Retrieves path of page template in current or parent template.
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*
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* Note: For block themes, use locate_block_template() function instead.
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*
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* The hierarchy for this template looks like:
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*
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* 1. {Page Template}.php
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* 2. page-{page_name}.php
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* 3. page-{id}.php
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* 4. page.php
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*
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* An example of this is:
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*
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* 1. page-templates/full-width.php
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* 2. page-about.php
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* 3. page-4.php
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* 4. page.php
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*
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* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
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* and {@see '$type_template'} dynamic hooks, where `$type` is 'page'.
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*
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* @since 1.5.0
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* @since 4.7.0 The decoded form of `page-{page_name}.php` was added to the top of the
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* template hierarchy when the page name contains multibyte characters.
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*
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* @see get_query_template()
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*
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* @return string Full path to page template file.
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*/
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function get_page_template() {
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$id = get_queried_object_id();
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$template = get_page_template_slug();
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$pagename = get_query_var( 'pagename' );
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if ( ! $pagename && $id ) {
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/*
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* If a static page is set as the front page, $pagename will not be set.
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* Retrieve it from the queried object.
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*/
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$post = get_queried_object();
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if ( $post ) {
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$pagename = $post->post_name;
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}
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}
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$templates = array();
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if ( $template && 0 === validate_file( $template ) ) {
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$templates[] = $template;
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}
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if ( $pagename ) {
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$pagename_decoded = urldecode( $pagename );
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if ( $pagename_decoded !== $pagename ) {
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$templates[] = "page-{$pagename_decoded}.php";
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}
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$templates[] = "page-{$pagename}.php";
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}
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if ( $id ) {
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$templates[] = "page-{$id}.php";
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}
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$templates[] = 'page.php';
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return get_query_template( 'page', $templates );
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}
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/**
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* Retrieves path of search template in current or parent template.
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*
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* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
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* and {@see '$type_template'} dynamic hooks, where `$type` is 'search'.
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*
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* @since 1.5.0
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*
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* @see get_query_template()
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*
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* @return string Full path to search template file.
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*/
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function get_search_template() {
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return get_query_template( 'search' );
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}
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/**
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* Retrieves path of single template in current or parent template. Applies to single Posts,
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* single Attachments, and single custom post types.
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*
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* The hierarchy for this template looks like:
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*
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* 1. {Post Type Template}.php
|
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* 2. single-{post_type}-{post_name}.php
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* 3. single-{post_type}.php
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* 4. single.php
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*
|
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* An example of this is:
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*
|
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* 1. templates/full-width.php
|
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* 2. single-post-hello-world.php
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* 3. single-post.php
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* 4. single.php
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*
|
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* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
|
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* and {@see '$type_template'} dynamic hooks, where `$type` is 'single'.
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*
|
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* @since 1.5.0
|
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* @since 4.4.0 `single-{post_type}-{post_name}.php` was added to the top of the template hierarchy.
|
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* @since 4.7.0 The decoded form of `single-{post_type}-{post_name}.php` was added to the top of the
|
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* template hierarchy when the post name contains multibyte characters.
|
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* @since 4.7.0 `{Post Type Template}.php` was added to the top of the template hierarchy.
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*
|
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* @see get_query_template()
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*
|
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* @return string Full path to single template file.
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*/
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function get_single_template() {
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$object = get_queried_object();
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$templates = array();
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if ( ! empty( $object->post_type ) ) {
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$template = get_page_template_slug( $object );
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if ( $template && 0 === validate_file( $template ) ) {
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$templates[] = $template;
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}
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$name_decoded = urldecode( $object->post_name );
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if ( $name_decoded !== $object->post_name ) {
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$templates[] = "single-{$object->post_type}-{$name_decoded}.php";
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}
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|
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$templates[] = "single-{$object->post_type}-{$object->post_name}.php";
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$templates[] = "single-{$object->post_type}.php";
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}
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$templates[] = 'single.php';
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return get_query_template( 'single', $templates );
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}
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/**
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* Retrieves an embed template path in the current or parent template.
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*
|
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* The hierarchy for this template looks like:
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*
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* 1. embed-{post_type}-{post_format}.php
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* 2. embed-{post_type}.php
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* 3. embed.php
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*
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* An example of this is:
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*
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* 1. embed-post-audio.php
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* 2. embed-post.php
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* 3. embed.php
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*
|
|
* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
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|
* and {@see '$type_template'} dynamic hooks, where `$type` is 'embed'.
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|
*
|
|
* @since 4.5.0
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|
*
|
|
* @see get_query_template()
|
|
*
|
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* @return string Full path to embed template file.
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*/
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function get_embed_template() {
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$object = get_queried_object();
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$templates = array();
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if ( ! empty( $object->post_type ) ) {
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$post_format = get_post_format( $object );
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if ( $post_format ) {
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$templates[] = "embed-{$object->post_type}-{$post_format}.php";
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}
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$templates[] = "embed-{$object->post_type}.php";
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}
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$templates[] = 'embed.php';
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|
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return get_query_template( 'embed', $templates );
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}
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/**
|
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* Retrieves the path of the singular template in current or parent template.
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|
*
|
|
* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
|
|
* and {@see '$type_template'} dynamic hooks, where `$type` is 'singular'.
|
|
*
|
|
* @since 4.3.0
|
|
*
|
|
* @see get_query_template()
|
|
*
|
|
* @return string Full path to singular template file
|
|
*/
|
|
function get_singular_template() {
|
|
return get_query_template( 'singular' );
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}
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|
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|
/**
|
|
* Retrieves path of attachment template in current or parent template.
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|
*
|
|
* The hierarchy for this template looks like:
|
|
*
|
|
* 1. {mime_type}-{sub_type}.php
|
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* 2. {sub_type}.php
|
|
* 3. {mime_type}.php
|
|
* 4. attachment.php
|
|
*
|
|
* An example of this is:
|
|
*
|
|
* 1. image-jpeg.php
|
|
* 2. jpeg.php
|
|
* 3. image.php
|
|
* 4. attachment.php
|
|
*
|
|
* The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
|
|
* and {@see '$type_template'} dynamic hooks, where `$type` is 'attachment'.
|
|
*
|
|
* @since 2.0.0
|
|
* @since 4.3.0 The order of the mime type logic was reversed so the hierarchy is more logical.
|
|
*
|
|
* @see get_query_template()
|
|
*
|
|
* @return string Full path to attachment template file.
|
|
*/
|
|
function get_attachment_template() {
|
|
$attachment = get_queried_object();
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|
|
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$templates = array();
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|
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if ( $attachment ) {
|
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if ( str_contains( $attachment->post_mime_type, '/' ) ) {
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list( $type, $subtype ) = explode( '/', $attachment->post_mime_type );
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} else {
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list( $type, $subtype ) = array( $attachment->post_mime_type, '' );
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}
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|
|
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if ( ! empty( $subtype ) ) {
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$templates[] = "{$type}-{$subtype}.php";
|
|
$templates[] = "{$subtype}.php";
|
|
}
|
|
$templates[] = "{$type}.php";
|
|
}
|
|
$templates[] = 'attachment.php';
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|
|
|
return get_query_template( 'attachment', $templates );
|
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}
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|
|
|
/**
|
|
* Set up the globals used for template loading.
|
|
*
|
|
* @since 6.5.0
|
|
*
|
|
* @global string $wp_stylesheet_path Path to current theme's stylesheet directory.
|
|
* @global string $wp_template_path Path to current theme's template directory.
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|
*/
|
|
function wp_set_template_globals() {
|
|
global $wp_stylesheet_path, $wp_template_path;
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|
|
|
$wp_stylesheet_path = get_stylesheet_directory();
|
|
$wp_template_path = get_template_directory();
|
|
}
|
|
|
|
/**
|
|
* Retrieves the name of the highest priority template file that exists.
|
|
*
|
|
* Searches in the stylesheet directory before the template directory and
|
|
* wp-includes/theme-compat so that themes which inherit from a parent theme
|
|
* can just overload one file.
|
|
*
|
|
* @since 2.7.0
|
|
* @since 5.5.0 The `$args` parameter was added.
|
|
*
|
|
* @global string $wp_stylesheet_path Path to current theme's stylesheet directory.
|
|
* @global string $wp_template_path Path to current theme's template directory.
|
|
*
|
|
* @param string|array $template_names Template file(s) to search for, in order.
|
|
* @param bool $load If true the template file will be loaded if it is found.
|
|
* @param bool $load_once Whether to require_once or require. Has no effect if `$load` is false.
|
|
* Default true.
|
|
* @param array $args Optional. Additional arguments passed to the template.
|
|
* Default empty array.
|
|
* @return string The template filename if one is located.
|
|
*/
|
|
function locate_template( $template_names, $load = false, $load_once = true, $args = array() ) {
|
|
global $wp_stylesheet_path, $wp_template_path;
|
|
|
|
if ( ! isset( $wp_stylesheet_path ) || ! isset( $wp_template_path ) ) {
|
|
wp_set_template_globals();
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|
}
|
|
|
|
$is_child_theme = is_child_theme();
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|
|
|
$located = '';
|
|
foreach ( (array) $template_names as $template_name ) {
|
|
if ( ! $template_name ) {
|
|
continue;
|
|
}
|
|
if ( file_exists( $wp_stylesheet_path . '/' . $template_name ) ) {
|
|
$located = $wp_stylesheet_path . '/' . $template_name;
|
|
break;
|
|
} elseif ( $is_child_theme && file_exists( $wp_template_path . '/' . $template_name ) ) {
|
|
$located = $wp_template_path . '/' . $template_name;
|
|
break;
|
|
} elseif ( file_exists( ABSPATH . WPINC . '/theme-compat/' . $template_name ) ) {
|
|
$located = ABSPATH . WPINC . '/theme-compat/' . $template_name;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ( $load && '' !== $located ) {
|
|
load_template( $located, $load_once, $args );
|
|
}
|
|
|
|
return $located;
|
|
}
|
|
|
|
/**
|
|
* Requires the template file with WordPress environment.
|
|
*
|
|
* The globals are set up for the template file to ensure that the WordPress
|
|
* environment is available from within the function. The query variables are
|
|
* also available.
|
|
*
|
|
* @since 1.5.0
|
|
* @since 5.5.0 The `$args` parameter was added.
|
|
*
|
|
* @global array $posts
|
|
* @global WP_Post $post Global post object.
|
|
* @global bool $wp_did_header
|
|
* @global WP_Query $wp_query WordPress Query object.
|
|
* @global WP_Rewrite $wp_rewrite WordPress rewrite component.
|
|
* @global wpdb $wpdb WordPress database abstraction object.
|
|
* @global string $wp_version
|
|
* @global WP $wp Current WordPress environment instance.
|
|
* @global int $id
|
|
* @global WP_Comment $comment Global comment object.
|
|
* @global int $user_ID
|
|
*
|
|
* @param string $_template_file Path to template file.
|
|
* @param bool $load_once Whether to require_once or require. Default true.
|
|
* @param array $args Optional. Additional arguments passed to the template.
|
|
* Default empty array.
|
|
*/
|
|
function load_template( $_template_file, $load_once = true, $args = array() ) {
|
|
global $posts, $post, $wp_did_header, $wp_query, $wp_rewrite, $wpdb, $wp_version, $wp, $id, $comment, $user_ID;
|
|
|
|
if ( is_array( $wp_query->query_vars ) ) {
|
|
/*
|
|
* This use of extract() cannot be removed. There are many possible ways that
|
|
* templates could depend on variables that it creates existing, and no way to
|
|
* detect and deprecate it.
|
|
*
|
|
* Passing the EXTR_SKIP flag is the safest option, ensuring globals and
|
|
* function variables cannot be overwritten.
|
|
*/
|
|
// phpcs:ignore WordPress.PHP.DontExtract.extract_extract
|
|
extract( $wp_query->query_vars, EXTR_SKIP );
|
|
}
|
|
|
|
if ( isset( $s ) ) {
|
|
$s = esc_attr( $s );
|
|
}
|
|
|
|
/**
|
|
* Fires before a template file is loaded.
|
|
*
|
|
* @since 6.1.0
|
|
*
|
|
* @param string $_template_file The full path to the template file.
|
|
* @param bool $load_once Whether to require_once or require.
|
|
* @param array $args Additional arguments passed to the template.
|
|
*/
|
|
do_action( 'wp_before_load_template', $_template_file, $load_once, $args );
|
|
|
|
if ( $load_once ) {
|
|
require_once $_template_file;
|
|
} else {
|
|
require $_template_file;
|
|
}
|
|
|
|
/**
|
|
* Fires after a template file is loaded.
|
|
*
|
|
* @since 6.1.0
|
|
*
|
|
* @param string $_template_file The full path to the template file.
|
|
* @param bool $load_once Whether to require_once or require.
|
|
* @param array $args Additional arguments passed to the template.
|
|
*/
|
|
do_action( 'wp_after_load_template', $_template_file, $load_once, $args );
|
|
}
|
|
|
|
/**
|
|
* Checks whether the template should be output buffered for enhancement.
|
|
*
|
|
* By default, an output buffer is only started if a {@see 'wp_template_enhancement_output_buffer'} filter has been
|
|
* added by the time a template is included at the {@see 'wp_before_include_template'} action. This allows template
|
|
* responses to be streamed as much as possible when no template enhancements are registered to apply.
|
|
*
|
|
* @since 6.9.0
|
|
*
|
|
* @return bool Whether the template should be output-buffered for enhancement.
|
|
*/
|
|
function wp_should_output_buffer_template_for_enhancement(): bool {
|
|
/**
|
|
* Filters whether the template should be output-buffered for enhancement.
|
|
*
|
|
* By default, an output buffer is only started if a {@see 'wp_template_enhancement_output_buffer'} filter has been
|
|
* added. For this default to apply, a filter must be added by the time the template is included at the
|
|
* {@see 'wp_before_include_template'} action. This allows template responses to be streamed as much as possible
|
|
* when no template enhancements are registered to apply. This filter allows a site to opt in to adding such
|
|
* template enhancement filters during the rendering of the template.
|
|
*
|
|
* @since 6.9.0
|
|
*
|
|
* @param bool $use_output_buffer Whether an output buffer is started.
|
|
*/
|
|
return (bool) apply_filters( 'wp_should_output_buffer_template_for_enhancement', has_filter( 'wp_template_enhancement_output_buffer' ) );
|
|
}
|
|
|
|
/**
|
|
* Starts the template enhancement output buffer.
|
|
*
|
|
* This function is called immediately before the template is included.
|
|
*
|
|
* @since 6.9.0
|
|
*
|
|
* @return bool Whether the output buffer successfully started.
|
|
*/
|
|
function wp_start_template_enhancement_output_buffer(): bool {
|
|
if ( ! wp_should_output_buffer_template_for_enhancement() ) {
|
|
return false;
|
|
}
|
|
|
|
$started = ob_start(
|
|
'wp_finalize_template_enhancement_output_buffer',
|
|
0, // Unlimited buffer size so that entire output is passed to the filter.
|
|
/*
|
|
* Instead of the default PHP_OUTPUT_HANDLER_STDFLAGS (cleanable, flushable, and removable) being used for
|
|
* flags, the PHP_OUTPUT_HANDLER_FLUSHABLE flag must be omitted. If the buffer were flushable, then each time
|
|
* that ob_flush() is called, a fragment of the output would be sent into the output buffer callback. This
|
|
* output buffer is intended to capture the entire response for processing, as indicated by the chunk size of 0.
|
|
* So the buffer does not allow flushing to ensure the entire buffer can be processed, such as for optimizing an
|
|
* entire HTML document, where markup in the HEAD may need to be adjusted based on markup that appears late in
|
|
* the BODY.
|
|
*
|
|
* If this ends up being problematic, then PHP_OUTPUT_HANDLER_FLUSHABLE could be added to the $flags and the
|
|
* output buffer callback could check if the phase is PHP_OUTPUT_HANDLER_FLUSH and abort any subsequent
|
|
* processing while also emitting a _doing_it_wrong().
|
|
*
|
|
* The output buffer needs to be removable because WordPress calls wp_ob_end_flush_all() and then calls
|
|
* wp_cache_close(). If the buffers are not all flushed before wp_cache_close() is closed, then some output buffer
|
|
* handlers (e.g. for caching plugins) may fail to be able to store the page output in the object cache.
|
|
* See <https://github.com/WordPress/performance/pull/1317#issuecomment-2271955356>.
|
|
*/
|
|
PHP_OUTPUT_HANDLER_STDFLAGS ^ PHP_OUTPUT_HANDLER_FLUSHABLE
|
|
);
|
|
|
|
if ( $started ) {
|
|
/**
|
|
* Fires when the template enhancement output buffer has started.
|
|
*
|
|
* @since 6.9.0
|
|
*/
|
|
do_action( 'wp_template_enhancement_output_buffer_started' );
|
|
}
|
|
|
|
return $started;
|
|
}
|
|
|
|
/**
|
|
* Finalizes the template enhancement output buffer.
|
|
*
|
|
* Checks to see if the output buffer is complete and contains HTML. If so, runs the content through
|
|
* the `wp_template_enhancement_output_buffer` filter. If not, the original content is returned.
|
|
*
|
|
* @since 6.9.0
|
|
*
|
|
* @see wp_start_template_enhancement_output_buffer()
|
|
*
|
|
* @param string $output Output buffer.
|
|
* @param int $phase Phase.
|
|
* @return string Finalized output buffer.
|
|
*/
|
|
function wp_finalize_template_enhancement_output_buffer( string $output, int $phase ): string {
|
|
// When the output is being cleaned (e.g. pending template is replaced with error page), do not send it through the filter.
|
|
if ( ( $phase & PHP_OUTPUT_HANDLER_CLEAN ) !== 0 ) {
|
|
return $output;
|
|
}
|
|
|
|
// Detect if the response is an HTML content type.
|
|
$is_html_content_type = null;
|
|
$html_content_types = array( 'text/html', 'application/xhtml+xml' );
|
|
foreach ( headers_list() as $header ) {
|
|
$header_parts = preg_split( '/\s*[:;]\s*/', strtolower( $header ) );
|
|
if (
|
|
is_array( $header_parts ) &&
|
|
count( $header_parts ) >= 2 &&
|
|
'content-type' === $header_parts[0]
|
|
) {
|
|
$is_html_content_type = in_array( $header_parts[1], $html_content_types, true );
|
|
break; // PHP only sends the first Content-Type header in the list.
|
|
}
|
|
}
|
|
if ( null === $is_html_content_type ) {
|
|
$is_html_content_type = in_array( ini_get( 'default_mimetype' ), $html_content_types, true );
|
|
}
|
|
|
|
// If the content type is not HTML, short-circuit since it is not relevant for enhancement.
|
|
if ( ! $is_html_content_type ) {
|
|
return $output;
|
|
}
|
|
|
|
$filtered_output = $output;
|
|
|
|
/**
|
|
* Filters the template enhancement output buffer prior to sending to the client.
|
|
*
|
|
* This filter only applies the HTML output of an included template. This filter is a progressive enhancement
|
|
* intended for applications such as optimizing markup to improve frontend page load performance. Sites must not
|
|
* depend on this filter applying since they may opt to stream the responses instead. Callbacks for this filter are
|
|
* highly discouraged from using regular expressions to do any kind of replacement on the output. Use the HTML API
|
|
* (either `WP_HTML_Tag_Processor` or `WP_HTML_Processor`), or else use {@see DOM\HtmlDocument} as of PHP 8.4 which
|
|
* fully supports HTML5.
|
|
*
|
|
* @since 6.9.0
|
|
*
|
|
* @param string $filtered_output HTML template enhancement output buffer.
|
|
* @param string $output Original HTML template output buffer.
|
|
*/
|
|
return (string) apply_filters( 'wp_template_enhancement_output_buffer', $filtered_output, $output );
|
|
}
|