php - Undefined variable in returning foreach loop -

i want write file scan script

this script must search in lot's of folders , make list files

i wrote script , return not working

function checkdir($dir) {     $file_array = array();    if (is_dir($dir)) {      $objects = scandir($dir);      foreach ($objects $key => $object) {        if ($object != "." && $object != "..") {          if (filetype($dir."/".$object) == "dir") {              // folder loop , try find files again              checkdir($dir."/".$object);              //$file_array[] = 'dir';           } else {              $file_array[] = $dir."/".$object;              //echo $dir."/".$object.'<br>';          }        }       }// end foreach      //reset($objects);    }      return $file_array;  } 

as can see in else condition wrote $file_array[] = $dir."/".$object; it's printing value can not store value array

the recursive call needs add results array:

$file_array = array_merge($file_array, checkdir($dir."/".$object)); 

whole function:

function checkdir($dir) {     $file_array = array();     if (is_dir($dir)) {         $objects = scandir($dir);         foreach ($objects $key => $object) {             if ($object != "." && $object != "..") {                 if (filetype($dir."/".$object) == "dir") {                     // folder loop , try find files again                     $file_array = array_merge($file_array, checkdir($dir."/".$object));                     //$file_array[] = 'dir';                 } else {                     $file_array[] = $dir."/".$object;                     //echo $dir."/".$object.'<br>';                 }             }         }// end foreach     //reset($objects);     }     return $file_array; }