"Deprecated" on the Appearance Menu page of the classic theme.

[nendeb55]

WordPress6.2 RC1-55510
PHP8.1.6
Theme Twenty Twenty-One

Deprecated: preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in D:\xampp\htdocs\wp620\wp-admin\includes\plugin.php on line 2088

Deprecated does not appear in PHP 8.0.

[costdev]

Hi @nendeb55, thanks for opening this ticket.

Are you running any plugins? This might be caused by a call to add_menu_page() or add_submenu_page() with $menu_slug set to null, for example.

Try disabling any plugins and see if the issue is gone. If not, can you confirm whether this issue occurs in WordPress 6.1.1?

[nendeb55]

I get the same "Deprecated" on WordPress 6.1.1.
I don't use any plugins.。

[costdev]

Thanks @nendeb55!

@SergeyBiryukov Looks like this is similar to #57578 - same deprecation, but a different screen.

@audrasjb While not introduced in 6.2, is this something we should try to resolve during the 6.2 cycle as we did with #57578 (i.e. an incomplete fix for Core passing null)?

[costdev]

As this also occurs on WordPress 6.1.1, I'm removing trunk as the Version to clear Report 40.

[audrasjb]

I'd target 6.2.1, we're a bit late in the release cycle and it's not a fatal, but only a deprecation warning.

[SergeyBiryukov]

Hi there, thanks for the ticket! I was able to reproduce the issue on a clean install.

Replying to costdev:

Looks like this is similar to #57578 - same deprecation, but a different screen.

Good catch, the fix indeed looks similar to [55263].

57918.diff​ resolved the notice in my testing, see comment:2:ticket:57578 for a deeper investigation.

[SergeyBiryukov]

In 55552:

Administration: Define the $title global on the Menus screen for classic themes.

This brings more consistency with other screens and avoids a PHP warning in get_plugin_page_hookname():

preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated

Follow-up to [13257], [13366], [55263].

Props nendeb55, costdev, SergeyBiryukov.
Fixes #57918.

[SergeyBiryukov]

Reopening for 6.2.1 consideration.

[costdev]

#57974 was marked as a duplicate.

[SergeyBiryukov]

In 55639:

Administration: Define the $title global on the Menus screen for classic themes.

This brings more consistency with other screens and avoids a PHP warning in get_plugin_page_hookname():

preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated

Follow-up to [13257], [13366], [55263].

Props nendeb55, costdev, SergeyBiryukov.
Merges [55552] to the 6.2 branch.
Fixes #57918.

[SergeyBiryukov]

#58283 was marked as a duplicate.