PHP Deprecated: strip_tags(): Passing null in admin-header.php

[bstkpera]

I get following error, when I open wp-admin/tools.php?page=action-scheduler (WPForms Plugin):
PHP Deprecated: strip_tags(): Passing null to parameter 1 ($string) of type string is deprecated in wp-admin/admin-header.php on line 36

Change the line to:

<?php
if ( isset( $title ) ) {
    $title = strip_tags( $title );
}

Tested with:
WordPress 6.6.1
PHP 8.2

[knutsp]

Hello @bstkpera, welcome to Trac and thank you for reporting this by opening a ticket here.

This seems to be a bug in the plugin, not WordPress core. If $title is not set on a plugin page I think this must be a bug in the plugin. Error messages are to inform developers of bugs in their code. The proposed change will only hide the error, not fix anything.

If this only happens when visting this plugin page in admin, I suggest reaching out to the plugin author.

[SergeyBiryukov]

Hi there, welcome to WordPress Trac!

Thanks for the report, we're already tracking this issue in #57579 and #57580.