Description:
------------
Why return functions in recursive functions doesn't exit and return 
value from function but instead loops until end of loop?

Reproduce code:
---------------
<?php
function check_folder($directory){
  if ($dir = @opendir($directory)){
  	while ($file = readdir($dir)) {
  		if (($file != ".")&&($file != "..")) {
  			$tempDir = $directory."/".$file;
  			if (is_dir($tempDir)) {
  			  check_folder($tempDir);
  			} else {
  			  $file_name = $directory."/".$file;
              $file_in_use=check_in_resources($file_name);
              if ($file_in_use!=false){ /                
                return 1;
              }
  			}
  		}
  	}
  }
  return 0;
}

Expected result:
----------------
i expected function to return 1 when var $file_in_use!=false. but it 
everytime returns 0

Actual result:
--------------
i expected function to return 1 when var $file_in_use!=false. but it 
everytime returns 0