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		$action=$_GET["action"];		$file_dir="images"; 		if(!isset($action)){        	$dir=opendir($file_dir);        	while ($file=readdir($dir)){                if ($file != "." && $file != ".."){					echo "<a href=".$file_dir."/".$file." target=_blank>".$file."</a><br>";                }        	}        } elseif ($action == "edit") {        	$fp=fopen($file, "a+");        	echo "<form action = ".$_SERVER['PHP_SELF']."?action=update&file=".$file." method = post><textarea rows=20 cols=60 name = newcontent></textarea><br><input type = submit value = Update></form>";        	fclose($fp); 		} elseif ($action == "Update"){        	$fp=fopen($file, "w");        	$new_content=$_POST['newcontent'];        	rename( '$file', 'newcontent' );        	fclose($fp);        	echo "Updated successfully.<br><br><a href=".$_SERVER['PHP_SELF'].">Return</a>";		}