[wp-trac] [WordPress Trac] #59818: [PHP 8.1] deprecated null in `explode()` for 'ping_sites' in `wp-admin/options-writing.php` with "Discourage search engines" on

[WordPress Trac]

#59818: [PHP 8.1] deprecated null in `explode()` for 'ping_sites' in `wp-admin
/options-writing.php` with "Discourage search engines" on
----------------------------------------------+----------------------------
 Reporter:  kitchin                           |       Owner:
                                              |  SergeyBiryukov
     Type:  defect (bug)                      |      Status:  accepted
 Priority:  normal                            |   Milestone:  6.6
Component:  Administration                    |     Version:
 Severity:  normal                            |  Resolution:
 Keywords:  php81 has-patch has-testing-info  |     Focuses:  php-
                                              |  compatibility
----------------------------------------------+----------------------------

Comment (by hellofromTonya):

 == Reproduction Report

 === Environment
 - OS: macOS 14.5
 - Web Server: Nginx
 - PHP: 8.3
 - WordPress: 6.6-beta2-58411
 - Browser: Firefox 126.0.1
 - Theme: TT4
 - Active Plugins: None

 == Testing Steps
 1. Ran `wp db reset --yes` to wipe the database.
 2. Walked through the install, while checking "Discourage search engines"
 option.
 3. Logged in.
 4. Navigated to Settings / Writing.
 5. Clicked "Save Changes" button.
 6. Then checked the logs.

 === Actual Results
 - ✅ Able to reproduce after clicking the "Save Changes" button.

 {{{
 [14-Jun-2024 15:38:51 UTC] PHP Deprecated:  explode(): Passing null to
 parameter #2 ($string) of type string is deprecated in ./wp-
 includes/formatting.php on line 4952
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/59818#comment:12>
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