_rest_array_intersect_key_recursive() WordPress Function

The rest_array_intersect_key_recursive() function is used to intersect two arrays using the provided keys. This function is similar to the array_intersect_key() function, except that it recursively intersects arrays of arrays.

_rest_array_intersect_key_recursive( array $array1, array $array2 ) #

function _rest_array_intersect_key_recursive( $array1, $array2 ) {
	$array1 = array_intersect_key( $array1, $array2 );
	foreach ( $array1 as $key => $value ) {
		if ( is_array( $value ) && is_array( $array2[ $key ] ) ) {
			$array1[ $key ] = _rest_array_intersect_key_recursive( $value, $array2[ $key ] );
		}
	}
	return $array1;
}