PHP small example of traversing files and folders

/**
* Traverse files and folders
* edit: bbs.it-home.org
* 2013/10/12
*/
 function list_dir($dirpath){
 //Determine whether the last character of the path is a backslash, if not, add one
 if( $dirpath[strlen($dirpath)-1] !='\'){ $dirpath.='\';}
 //Declare a static variable array, so that the value of the array will still exist every time it is called recursively
 static $result_array = array();
 //Determine whether the given directory is a directory
 if(is_dir($dirpath)){
 //Get the current subdirectory and file name
 $file_dirs = scandir($dirpath);// scandir -- List the files and directories in the specified path
 //If there are two special directories, skip them
 foreach($file_dirs as $file){
 if($file == '.' || $file = ='..'){ continue;}
 if(is_dir($dirpath.$file)){
 //Directory, call recursively
 list_dir($dirpath.$file.'\');
 }else{
 //File, store it in the array
 array_push($result_array,$dirpath.$file);
 }
 }
 }
 return $result_array;
 }

 //Call function
 $array = list_dir('d:\ php5');
 foreach($array as $value){
 echo $value;
 echo'';
 }
?>