Simple PHP script to walk and print a directory tree

<?php
function walk_dir($dir){
	$relativedir = '.'.$dir;
	if($dh = opendir($relativedir)){
	while(false !== ($file = readdir($dh))){
		if(($file !== '.') && ($file !== '..')){
			if(!is_dir($relativedir.$file)){
				echo '<a href="'.$dir.$file.'" title="'.$file.'">'.$file.'</a>'."\n";
			}else{
				walk_dir($dir.$file.'/');
			}
		}
	}
	}
}

walk_dir('/');
?>