webwall-png

    public function resizeimg($filename, $smallimage, $w, $h)
    {
        $ratio = $w/$h;
        $size_img = getimagesize($filename);
        $src_ratio=$size_img[0]/$size_img[1];
        if($ratio<$src_ratio) $h = $w/$src_ratio;
        else $w = $h*$src_ratio;
        $dest_img = imagecreatetruecolor($w, $h);
        $white = imagecolorallocate($dest_img, 255, 255, 255);
        switch($size_img[2])
        {
            case 1:
            {
                $src_img = imagecreatefromgif($filename);
                imagecopyresampled($dest_img, $src_img, 0, 0, 0, 0, $w, $h, $size_img[0], $size_img[1]);
                imagegif($dest_img, $smallimage);
            }
            case 2:
            {
                $src_img = imagecreatefromjpeg($filename);
                imagecopyresampled($dest_img, $src_img, 0, 0, 0, 0, $w, $h, $size_img[0], $size_img[1]);
                imagejpeg($dest_img, $smallimage);
            }
            case 3:
            {
                $src_img = imagecreatefrompng($filename);
                imagealphablending($src_img, false );
                imagesavealpha($src_img, true );
                imagecopyresampled($dest_img, $src_img, 0, 0, 0, 0, $w, $h, $size_img[0], $size_img[1]);
                imagepng($dest_img, $smallimage);
            }
        }
        imagedestroy($dest_img);
        imagedestroy($src_img);
        return true;
    }