PHP - Animated Gifs Using Gd

Im working with the animatedcollapse.js file which collapses divs. I need to collapse divs with the id's 1,2,3,4. Simple enough.

However they wont always be 1,2,3,4 as these are the ids (forum_id) pulled from the database. the animatedcollapse.js script requires the names of the divs to be entered like so:

<a href=\"javascript:animatedcollapse.show(['1','2','3','4'])\">

but like i said it won't always be 1,2,3,4 so how can i pull the id's and add them to that href? i was thinking an array but ive never worked with them before so i cant get it to work.

I need to pull all of the forum_id's where parent_id = 1 and then add the id's to the href.

I wish to use the code from the following page that can be used to check if an uploaded image is an animated GIF:
http://stackoverflow.com/questions/280658/can-i-detect-animated-gifs-using-php-and-gd

Here is the function:
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;
}


Am I right in saying that there are curly brackets missing after the while line? The indenting indicates that both of the 2 following lines should be included in the while loop, but the lack of curly brackets mean that only the line beginning with $chunk is included in the loop.

The code actually seems to work with and without the curly brackets. Does anyone understand this code well enough to know whether or not the curly brackets should be included?

Thanks in advance.