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wordpress/wp-includes
Sergey Biryukov 7f0fc452b1 Docs: Improve @since notes for some WP_Filesystem_* methods:
* `WP_Filesystem_FTPext::exists()`
* `WP_Filesystem_FTPext::size()`
* `WP_Filesystem_ftpsockets::exists()`

The `::exists()` methods were previously using the FTP `NLST` command, which works for directories, but is not intended to be applied to a file. This only worked most of the time due to many FTP servers being permissive and allowing to execute `NLST` on files, which cannot be guaranteed and appears to not be the case in newer versions of Pure-FTPd (1.0.48 or later).

With a recent change in [53860], both methods were updated for compatibility with RFC 959:

* Both methods check if the path is a directory that can be changed into (and therefore exists).
* `WP_Filesystem_FTPext` uses `ftp_rawlist()` (FTP `LIST` command) to check for file existence.
* `WP_Filesystem_ftpsockets` uses file size to check for file existence.

Reference: [https://www.ietf.org/rfc/rfc959.txt RFC 959: File Transfer Protocol (FTP)]

Follow-up to [6779], [11821], [25274], [33648], [34733], [35944], [35946], [53860].

See #51170.
Built from https://develop.svn.wordpress.org/trunk@53862


git-svn-id: http://core.svn.wordpress.org/trunk@53421 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2022-08-08 17:14:13 +00:00
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