Why PHP Script for read directory content no update directory changes at second execution

<?php 
header( "cache-control: private" );
header( "pragma: no-cache" );
header("Content-Type: text/xml");
echo "<?xml version=\"1.0\" encoding=\"utf-8\"?>"."\n";
$directory = "../".$_GET['directory'];
echo "<gallery>"."\n";
ExportDirectoryXML($directory);
echo "</gallery>";
 
function ExportDirectoryXML($base)
{ 
	if ($dir = @opendir($base))
	{ 
		while ($file = readdir($dir))
		{ 
			if ($file{0} != ".")
			{ 
				if (is_dir($base . "/" . $file))
				{ 
				}
				else
				{
					$ext = @substr($file, (@strrpos($file, ".") ? @strrpos($file, ".") : @strlen($file)), @strlen($file));
					$fname = basename($file,$ext);
					$imgsrc= $base . "/" . $file;
					$imgsrc= substr($imgsrc, 3);
					echo "<image>"."\n";
					echo "<label>".$file."</label>"."\n";
					echo "<path>".$imgsrc."</path>"."\n";
					echo "</image>"."\n";
				}
			} 
		} //end while 
		closedir($dir); 
	} // end if
} //end function 
?>

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