PHP traverse directory

Traverse all directories and files in the specified directory

 function list_dir($dir){

 static $result = array();
 if(is_dir($dir)){

 $file_dir = scandir($dir);// List files and directories in the specified path
 foreach($file_dir as $file){
 if($file == '.'||$file == '..'){
 continue;
 }elseif(is_dir( $dir.$file)){
 list_dir($dir.$file.'/');
 }else{
 array_push($result,$dir.$file);//Data pushed onto the stack
 }
 }
 }
 return $result;
 }



 $arr = list_dir('E:/wwwroot/test/');
 print_r($arr);
?>