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Detecting if a .gif image is animated
source: http://www.php.net/manual/en/function.imagecreatefromgif.php#88005

<?
function is_ani($filename) {
    if(!($fh = @fopen($filename, 'rb')))
        return false;
    $count = 0;
    //an animated gif contains multiple "frames", with each frame having a
    //header made up of:
    // * a static 4-byte sequence (\x00\x21\xF9\x04)
    // * 4 variable bytes
    // * a static 2-byte sequence (\x00\x2C)

    // We read through the file til we reach the end of the file, or we've found
    // at least 2 frame headers
    while(!feof($fh) && $count < 2)
        $chunk = fread($fh, 1024 * 100); //read 100kb at a time
        $count += preg_match_all('#\x00\x21\xF9\x04.{4}\x00\x2C#s', $chunk, $matches);

    fclose($fh);
    return $count > 1;
}
?>


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Determining the dimensions of an image with PHP		Read Next:
Using FFMPEG to get the dimensions of a video
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  • Global (via Email/Skype/AIM(ichat)/Yahoo)
    • Web Development Consulting
    • Custom Web App Development (PHP/MySQL/jQuery/CSS) Cross-Browser & OS
    • Cellphone App Development (Android/MobileWeb)
    • Music Lessons & Education for Beginner Guitar, Piano, Bass, which transfers over to many other instruments I am comfortable playing but not yet at teaching.
    • Music - Soundtrack Composition & Voice Work
  • Local, Most all the above, but also:
    • Music Performance (Harp, Voice, Guitar, Piano, Bass, Latin Percussion)
    • Being your venue's soundman
    • Video Streaming live music and other live events anywhere that can provide wifi
    • Training Video Streaming to your venue's trusted soundperson