[wp-trac] [WordPress Trac] #64351: I found an issue in WordPress version 6.9 when exporting All Content.

[WordPress Trac]

#64351: I found an issue in WordPress version 6.9 when exporting All Content.
--------------------------+-----------------------------
 Reporter:  mamunur105    |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Export        |    Version:  6.9
 Severity:  major         |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 The export process throws an error related to the wxr_cdata() function.

 The problem happens because the function is called with values that are
 not always strings — sometimes a meta value is null or another type. When
 that happens, the function breaks during export.

 [
 {{{
 04-Dec-2025 07:13:56 UTC] PHP Fatal error:  Uncaught TypeError:
 wp_is_valid_utf8(): Argument #1 ($bytes) must be of type string, null
 given, called in /Users/radiustheme07/Local Sites/shopbuilder/app/public
 /wp-admin/includes/export.php on line 246 and defined in
 /Users/radiustheme07/Local Sites/shopbuilder/app/public/wp-
 includes/utf8.php:39
 Stack trace:
 #0 /Users/radiustheme07/Local Sites/shopbuilder/app/public/wp-
 admin/includes/export.php(246): wp_is_valid_utf8(NULL)
 #1 /Users/radiustheme07/Local Sites/shopbuilder/app/public/wp-
 admin/includes/export.php(682): wxr_cdata(NULL)
 #2 /Users/radiustheme07/Local Sites/shopbuilder/app/public/wp-
 admin/export.php(123): export_wp(Array)
 #3 {main}
   thrown in /Users/radiustheme07/Local Sites/shopbuilder/app/public/wp-
 includes/utf8.php on line 39

 }}}



 To fix it, WordPress should add a simple type check before processing the
 value. For example:

 {{{#!php
 <?php

 function wxr_cdata( $str ) {
         // Make sure the value is a string before processing.
         if ( ! is_string( $str ) ) {
                 return '<![CDATA[]]>'; // Fail-safe output for invalid or
 null values.
         }

         if ( ! wp_is_valid_utf8( $str ) ) {
                 $str = utf8_encode( $str );
         }

         $str = '<![CDATA[' . str_replace( ']]>', ']]]]><![CDATA[>', $str )
 . ']]>';

         return $str;
 }

 }}}

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/64351>
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