Using PHP imagecreatefromgif to Load and Process GIF Images

imagecreatefromgif() creates an image resource from a GIF file or URL, returning FALSE on failure.

Parameter: filename – path to the GIF file.

Return value: on success a resource, on failure FALSE.

Example usage:

<?php
function LoadGif($imgname) {
    $im = @imagecreatefromgif($imgname);
    if (!$im) {
        $im = imagecreatetruecolor(150,30);
        $bgc = imagecolorallocate($im,255,255,255);
        $tc = imagecolorallocate($im,0,0,0);
        imagefilledrectangle($im,0,0,150,30,$bgc);
        imagestring($im,1,5,5,5,'Error loading '.$imgname,$tc);
    }
    return $im;
}
header('Content-Type: image/gif');
$img = LoadGif('bogus.image');
imagegif($img);
imagedestroy($img);
?>

The script attempts to load a GIF, creates a placeholder image with an error message if loading fails, and outputs the result as a GIF.