From 7e331ab23539a5ec73d3de393e60d4fd9775c1ab Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov.ru@gmail.com>
Date: Sun, 2 Feb 2020 03:08:04 +0000
Subject: [PATCH] Post Thumbnails: Make sure `get_post_thumbnail_id()` returns
 an integer, to match the documented return value.

This makes the function more consistent with `get_the_ID()` or `wp_get_post_parent_id()`, both returning an integer.

Props 0v3rth3d4wn.
Fixes #40096.
Built from https://develop.svn.wordpress.org/trunk@47160


git-svn-id: http://core.svn.wordpress.org/trunk@46960 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/post-thumbnail-template.php | 4 ++--
 wp-includes/version.php                 | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/wp-includes/post-thumbnail-template.php b/wp-includes/post-thumbnail-template.php
index 8202f4eb6a..85fb0e31d9 100644
--- a/wp-includes/post-thumbnail-template.php
+++ b/wp-includes/post-thumbnail-template.php
@@ -45,14 +45,14 @@ function has_post_thumbnail( $post = null ) {
  * @since 4.4.0 `$post` can be a post ID or WP_Post object.
  *
  * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
- * @return string|int Post thumbnail ID or empty string.
+ * @return int|string Post thumbnail ID or empty string if the post does not exist.
  */
 function get_post_thumbnail_id( $post = null ) {
 	$post = get_post( $post );
 	if ( ! $post ) {
 		return '';
 	}
-	return get_post_meta( $post->ID, '_thumbnail_id', true );
+	return (int) get_post_meta( $post->ID, '_thumbnail_id', true );
 }
 
 /**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index c770de9400..094d3b2912 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.4-alpha-47159';
+$wp_version = '5.4-alpha-47160';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.