imagecreatethumbnail.func.php

<?php


/**
 * Creates a thumbnail for any type of pre-existing image. Always saves as PNG image
 * Works properly with GIF transparency and PNG Alpha Transparency.
 * If Image is less than max_width and max_height it will stay at the size of the image.
 *
 * @param string - The location of the pre-existing image.
 * @param string - The location to save the thumbnail, including filename and extension.
 * @param int    - The Maximum Width, Default of 150
 * @param int    - The Maximum Height, Default of 150
 * @return bool  - Success of saving the thumbnail.
 */
function imagecreatethumbnail($file,$output,$max_width = 150,$max_height = 150)
{
        $img = imagecreatefromstring(file_get_contents($file));
        list($width, $height, $type, $attr) = getimagesize($file);
        if($height > $max_height || $width > $max_width)
        {
                if($width > $height) { $thumb_width = $max_width; $thumb_height = ceil(($height * $thumb_width)/$width); }
                else { $thumb_height = $max_height; $thumb_width = ceil(($width * $thumb_height)/$height); }
        } else {
                $thumb_width = $width;
                $thumb_height = $height;
        }
        imagesavealpha($img,true);
        $thumb = imagecreatetruecolor($thumb_width,$thumb_height);
        imagesavealpha($thumb,true);
        imagealphablending($thumb,false);
        imagecopyresampled($thumb,$img,0,0,0,0,$thumb_width,$thumb_height,$width,$height);
        $return = imagepng($thumb,$output);
        imagedestroy($img);
        imagedestroy($thumb);
        return $return;
}

?>