PHP Manual . ... PHP 4 >= 4.0.0) get_included_files -- Returns an array with the names of included or required files . ... Returns an array of the names of all files that have been included using include() , include_once() , require() or require_once() . ... php include("test1.php"); include_once("test2.php"); require("test3.php"); require_once("test4.php"); $included_files = get_included_files(); foreach($included_files as $filename) { echo "$filename\n"; } ?> will generate the following output: . ...