[wp-trac] [WordPress Trac] #59275: PHP 8.1 Deprecated function: rtrim(): Passing null to parameter

[WordPress Trac]

#59275: PHP 8.1 Deprecated function: rtrim(): Passing null to parameter
-------------------------------+-----------------------------
 Reporter:  srishtis           |      Owner:  (none)
     Type:  defect (bug)       |     Status:  assigned
 Priority:  normal             |  Milestone:  Awaiting Review
Component:  Formatting         |    Version:  6.2.2
 Severity:  normal             |   Keywords:
  Focuses:  php-compatibility  |
-------------------------------+-----------------------------
 Deprecated - rtrim(): Passing null to parameter #1 ($string) of type
 string is deprecated

 used in
 wp-includes/formatting.php:2809
 rtrim()
 wp-includes/formatting.php:2809
 untrailingslashit()
 wp-includes/formatting.php:2794
 trailingslashit()
 wp-content/mu-plugins/http-concat/concat-utils.php:27
 WPCOM_Concat_Utils::realpath()
 wp-content/mu-plugins/http-concat/cssconcat.php:84
 WPcom_CSS_Concat->do_items()
 wp-includes/functions.wp-styles.php:68
 wp_print_styles()
 wp-includes/class-wp-hook.php:308
 do_action('wp_head')
 wp-includes/general-template.php:3049
 wp_head()
 wp-includes/template-canvas.php:17
 MU Plugin: http-concat

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Ticket URL: <https://core.trac.wordpress.org/ticket/59275>
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