IF/THEN with Image

[mcmuney]

Is there a way to determine if an image that included on a page is a good link or a bad link? I'd like to use an if/then statement to redirect users if the image on the page is a bad link.

[vbnullchar]

javascript?

[pdkv2]

i am not getting what exactly you want to do.

[mcmuney]

Basically, I have a php page, which shows an image based on the id attached to the link. For example, page.php?image_id=123, this page will display 123.jpg on that page. Now lets say that this image is removed or the file is corrupted. Now when people visit page.php?image_id=123, it'll simply show a bad image link.

 

What I want to do is use an if/then statement to redirect the user if the image link/path is bad.

[revraz]

Not sure how you can check if it's corrupt or not, but you can check if the file exists.

 

http://www.php.net/function.file-exists

[ratcateme]

you could create a script with php GD to load the image e.g.

 

page.php:

<?php
function LoadJpeg($imgname)
{
    $im = @imagecreatefromjpeg($imgname); /* Attempt to open */
    if (!$im) { /* See if it failed */
        $im  = imagecreatetruecolor(300, 30); /* Create a black image */
        $bgc = imagecolorallocate($im, 255, 255, 255);
        $tc  = imagecolorallocate($im, 0, 0, 0);
        imagefilledrectangle($im, 0, 0, 300, 30, $bgc);
        /* Output an errmsg */
        imagestring($im, 16, 5, 5, "Error loading $imgname", $tc);
    }
    return $im;
}
header("Content-Type: image/jpeg");
$img = LoadJpeg($_GET['image_id'].".jpg");
imagejpeg($img);
?>

 

Scott.

 

[Mirkules]

You can also use file headers to verify the image: http://www.mikekunz.com/image_file_header.html