Image Placeholder Function

function ph_img($width, $height = NULL) {
    $url = 'http://placehold.it/';
        if($height == NULL) {
            return $url . $width;
        }
    return $url . $width . 'X' . $height;
}

/*

PLACEHOLDER USAGE:
<img src="<?=ph_img(250);?>"/> //square image 250x250
<img src="<?=ph_img(250,150);?>"/> //image 250x150

*/