add_{$meta_type}_metadata

apply_filters('add_{$meta_type}_metadata') is found 1 times:

• /wp-includes/meta.php line 80

  	 * @param string    $meta_key   Metadata key.
  	 * @param mixed     $meta_value Metadata value. Must be serializable if non-scalar.
  	 * @param bool      $unique     Whether the specified meta key should be unique for the object.
  	 */
  	$check = apply_filters( "add_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $unique );
  	if ( null !== $check ) {
  		return $check;
  	}
  
  	if ( $unique && $wpdb->get_var(
  		$wpdb->prepare(
  

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