<?php
$d = dirname($_SERVER['QUERY_STRING']);
$p = realpath($d);
$fp = basename($_SERVER['QUERY_STRING']);
if ( strpos($p,getcwd()."/") === 0 ) {
    foreach (scandir($p) as $f) {
        if (strpos( $f, $fp) === (strlen($f) - strlen($fp)) ) {
            header("Location: $d/$f");
            die();
        }
    }
}
header("Location: .");
die();
?>