[wp-trac] [WordPress Trac] #62785: wp_kses_no_null() should be modified to handle $content having a null value

[WordPress Trac]

#62785: wp_kses_no_null() should be modified to handle $content having a null value
-------------------------------------------------+-------------------------
 Reporter:  room34                               |       Owner:  (none)
     Type:  defect (bug)                         |      Status:  new
 Priority:  normal                               |   Milestone:  Awaiting
                                                 |  Review
Component:  Formatting                           |     Version:
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch has-unit-tests php81       |     Focuses:  php-
  needs-testing                                  |  compatibility
-------------------------------------------------+-------------------------

Comment (by huzaifaalmesbah):

 == Test Report

 Patch tested: https://github.com/WordPress/wordpress-develop/pull/8096

 === Steps to Reproduce or Test
 1. Create a plugin file any named (e.g: reproduce-kses-null.php) with the
 Helper Plugin Code provided below.
 2. Navigate to the WordPress admin dashboard and activate the plugin.
 3. Observe the admin notice displayed at the top of the screen.

 === Helper Plugin Code

 {{{
 <?php
 /**
  * Plugin Name: Reproduce KSES Null Issue
  */

 add_action( 'admin_notices', function() {
         $err = null;
         $old = error_reporting( E_ALL );

         set_error_handler( function( $no, $str ) use ( &$err ) {
                 if ( strpos( $str, 'Passing null' ) !== false ) $err =
 $str;
         } );

         wp_kses_no_null( null );

         restore_error_handler();
         error_reporting( $old );

         $class = $err ? 'error' : 'success';
         $msg   = $err ? "FAIL: $err" : 'PASS: No deprecation warning.';
         echo "<div class='notice notice-$class'><p>$msg of
 wp_kses_no_null</p></div>";
 } );

 }}}


 === Expected Results
 - ✅ The function `wp_kses_no_null( null )` should return an empty string.
 - ✅ No deprecation warnings (e.g., preg_replace(): Passing null...)
 should be triggered.


 === Environment
 - WordPress: 7.0-alpha-61215-src
 - PHP: 8.2.29
 - Server: nginx/1.29.4
 - Database: mysqli (Server: 8.4.7 / Client: mysqlnd 8.2.29)
 - Browser: Chrome 143.0.0.0
 - OS: macOS
 - Theme: Twenty Twenty-Five 1.4
 - MU Plugins: None activated
 - Plugins:
   * Reproduce KSES Null Issue
   * Test Reports 1.2.1



 ==== Actual Results
 Before applying the patch
 - ❌ A deprecation warning notice was displayed: FAIL: Deprecation warning
 detected...

 After applying the bugfix patch
 - ✅ Issue resolved. The success notice PASS: No deprecation warning. is
 displayed.


 === Screenshots
 || Before Apply Patch || After Apply Patch ✅ ||
 || [[Image(https://i.ibb.co/qSmD9NK/Huzaifa-20260114155814.png)]] ||
 [[Image(https://i.ibb.co/27ghYqv7/Huzaifa-20260114155745.png)]] ||

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Ticket URL: <https://core.trac.wordpress.org/ticket/62785#comment:7>
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