[wp-trac] [WordPress Trac] #59195: deprecation notice triggered in post.php by passing null to parameter #2 in preg_match()

[WordPress Trac]

#59195: deprecation notice triggered in post.php by passing null to parameter #2 in
preg_match()
-------------------------------------------------+-------------------------
 Reporter:  nosilver4u                           |       Owner:
                                                 |  hellofromTonya
     Type:  defect (bug)                         |      Status:  closed
 Priority:  normal                               |   Milestone:  6.6
Component:  Media                                |     Version:  6.3
 Severity:  normal                               |  Resolution:  fixed
 Keywords:  php81 has-patch has-unit-tests has-  |     Focuses:  php-
  testing-info commit                            |  compatibility
-------------------------------------------------+-------------------------
Changes (by hellofromTonya):

 * status:  reviewing => closed
 * resolution:   => fixed


Comment:

 In [changeset:"58437" 58437]:
 {{{
 #!CommitTicketReference repository="" revision="58437"
 Code Modernization: Fix non-nullable deprecation in
 get_available_post_mime_types().

 Fixes a PHP 8.1 and above "null to non-nullable" deprecation notice in
 `get_available_post_mime_types()`:

 {{{
 Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type
 string is deprecated in ./wp-includes/post.php on line 3395
 }}}

 [https://developer.wordpress.org/reference/functions/get_available_post_mime_types/#return
 This function is documented] to:
 * Return `An array of MIME types.`
 * as an array of `string`s, i.e. `string[]`.

 A `null` or empty element within the returned array is not a valid MIME
 type. If a `null` exists in the returned array, it is the root cause of
 PHP throwing the deprecation notice.

 This commit removes the `null` and empty elements from the returned array
 of MIME types. It also adds a unit test.

 Follow-up to [56623], [56452].

 Props nosilver4u, jrf, ironprogrammer, antpb, antonvlasenko, rajinsharwar,
 hellofromTonya.
 Fixes #59195.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/59195#comment:20>
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