apply_filters( “update_{$meta_type}_metadata”, null|bool $check, int $object_id, string $meta_key, mixed $meta_value, mixed $prev_value )

User Contributed Notes

1. Skip to note 3 content

   Steven Lin 5 years ago

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   Example migrated from Codex:

   The example below skips saving the metadata with the key ‘foo’ and an empty value. For other metadata, continue the normal execution.

   add_action( 'init', 'wpdocs_init' );
   
   function wpdocs_init() {
      add_filter( 'update_user_metadata', 'wpdocs_update_foo', 10, 4 );
   }
   
   function wpdocs_update_foo( $check, $object_id, $meta_key, $meta_value ) {
   
      if ( 'foo' == $meta_key && empty( $meta_value ) ) {
         return false; // this means: stop saving the value into the database
      }
   
      return $check; // this means: go on with the normal execution in meta.php
   }
2. Skip to note 4 content

   crstauf 5 years ago

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   Similar to stevenlinx’s example, to skip saving empty value of foo to user metadata. Note that this could create problems if the user is attempting to clear previously entered data; an additional hook should be included that deletes the foo key from the user’s metadata if the value is empty.

   add_filter( 'update_user_metadata', function( $check, $object_id, $meta_key, $meta_value ) {
   
       // Already short-circuited; bail.
       if ( null !== $check )
           return $check;
   
       // Bail if not saving the 'foo' metadata.
       if ( 'foo' !== $meta_key )
           return null;
   
       // If meta value is not empty, then we _want_ to save it.
       if ( ! empty( $meta_value ) )
           return null;
   
       // Prevent saving empty value to user's 'foo' metadata.
       return false;
   }, 10, 4 );