[wp-trac] [WordPress Trac] #53635: PHP 8.1: various compatibility fixes

[WordPress Trac]

#53635: PHP 8.1: various compatibility fixes
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 Reporter:  SergeyBiryukov                  |       Owner:  hellofromTonya
     Type:  task (blessed)                  |      Status:  accepted
 Priority:  normal                          |   Milestone:  5.9
Component:  General                         |     Version:
 Severity:  normal                          |  Resolution:
 Keywords:  php81 has-patch has-unit-tests  |     Focuses:  coding-
                                            |  standards
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Comment (by spacedmonkey):

 As part of my work on the plugin Web stories, we upgraded our tests to run
 under PHP 8.1. There were a couple of notice errors we saw in our
 [https://github.com/google/web-stories-
 wp/runs/4336028931?check_suite_focus=true#step:15:36 logs].

 These errors are

 > PHP Deprecated:  rtrim(): Passing null to parameter #1 ($string) of type
 string is deprecated in /tmp/wordpress/wp-includes/formatting.php on line
 2753

 > PHP Deprecated:  trim(): Passing null to parameter #1 ($string) of type
 string is deprecated in /tmp/wordpress/wp-includes/class-wp-user.php on
 line 211

 These will need to be fixed for full PHP 8.1 support.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53635#comment:151>
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