php 深度优先递归输出路径上所有文件

<?php     $dir = "/home/mengjun/IdeaProjects/phone/original-data/data/jiangsu";    fun($dir,0);    function fun($dir,$dep){        $floders  = array();        $files = array();        if (is_dir($dir)) {           $temp = scandir($dir,$dep);           foreach($temp as $t){                if(is_dir($dir.'/'.$t)){                    if($t[0]!='.'){                        $floders[] = $dir.'/'.$t;                     }                }else{                    $files[] = $dir.'/'.$t;                }           }                     $tab = '';           for($i = 0;$i<$dep;$i++){                    $tab .= '&nbsp&nbsp&nbsp&nbsp';           }           foreach($floders as $f){                echo $tab.'floder: '.$f.'<br>';                fun($f,++$dep);           }           foreach($files as $f){                echo $tab.'file: '.$f.'<br>';           }                   }       }?>