This function is an alias of: get_included_files().
<?php // This file is abc.php include 'test1.php'; include_once 'test2.php'; require 'test3.php'; require_once 'test4.php'; $required_files = get_required_files(); foreach ($included_files as $filename) { echo "$filename\n"; } ?> The above example will output: copy to clipboard abc.php test1.php test2.php test3.php test4.php