check for valid image via http

[sde]

the file_exists() command works for local files, but i'm in search of a way to do this with a remote file.

i need to check if an image exists on an external server over http before i display it to the browser.

anyone know how i can achieve this?

[idx]

fopen.

PHP Code:

<?php
   $url = 'http://domain.com/foo.gif';

   $fp = @fopen($url,'r');

   if (!$fp) {
      echo "ERROR - URL {$url}, not accessable";
   }
   else {
      echo 'YES';
   }

?>

..or if it's applicable have the script check every X minutes to see if the image is available and if so download it to the local server..

-r

[sde]

thanks a lot.

[sde]

unfortunately it is making my page lag a lot. i guess since the server is opening the image before the client is. this is just a temporary problem while i'm developing this web app anyway. later i'll have the images local.

is there any other way to check if the file is valid without opening it?

[sde]

now i'm trying to get the dimensions of a image remotely so i can resize the displayed image if it is too big.

[sde]

PHP Code:

<?
list($width, $height) = getimagesize($url);
?>

i did not realize getimagesize() would work remotely. sweet!

[idx]

lol. That's cool.

The only other way might be to formulate some kind of http request (curl?) and check the response code. So the file is never downloaded...

-r