Source View: delete_{$meta_type}_metadata

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Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

  • Action hooks look like this: do_action( "hook_name" )
  • Filter hooks look like this: apply_filters( "hook_name", "what_to_filter" ).

Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.

Source View

Line Code
186
187      global $wpdb;
188
189      $type_column = esc_sql($meta_type . '_id');
190      $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id';
191      // expected_slashed ($meta_key)
192      $meta_key = stripslashes($meta_key);
193      $meta_value = stripslashes_deep($meta_value);
194
195      $check = apply_filters( "delete_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $delete_all );
196      if ( null !== $check )
197           return (bool) $check;
198
199      $_meta_value = $meta_value;
200      $meta_value = maybe_serialize( $meta_value );
201
202      $query = $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s", $meta_key );
203
204      if ( !$delete_all )