Traverse all files and folders in a folder php code

php traverses all files and folders under a certain folder

function list_dir($dirpath){
 if($dirpath[strlen($dirpath)-1]!="\"){$dirpath.= "\";}
 static $result_array=array();
 if(is_dir($dirpath)){
 $handle=opendir($dirpath);
 while($file=readdir($handle)){
 if( $file=="."||$file==".."){continue;}
 if(is_dir($dirpath.$file)){
 list_dir($dirpath.$file."\");
 }else{
 array_push($result_array,$dirpath.$file);
 }
 }
 closedir($handle);
 }
 return $result_array;
 }

 $array=list_dir("D:www");
 foreach($array as $value){
 echo $value;
 echo "";
 }

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