Method imageRotate

/* This function is provided by php manual (function.imagerotate.php)
	It's a workaround to enables image rotation on distributions which do not
	use the bundled gd library (e.g. Debian, Ubuntu).
	*/
public static function imageRotate($src_img, $angle, $colBlack = 0)
{
    if (!imageistruecolor($src_img)) {
        $w = imagesx($src_img);
        $h = imagesy($src_img);
        $t_im = imagecreatetruecolor($w, $h);
        imagecopy($t_im, $src_img, 0, 0, 0, 0, $w, $h);
        $src_img = $t_im;
    }
    $src_x = imagesx($src_img);
    $src_y = imagesy($src_img);
    if ($angle == 180) {
        $dest_x = $src_x;
        $dest_y = $src_y;
    } elseif ($src_x <= $src_y) {
        $dest_x = $src_y;
        $dest_y = $src_x;
    } elseif ($src_x >= $src_y) {
        $dest_x = $src_y;
        $dest_y = $src_x;
    }
    $rotate = imagecreatetruecolor($dest_x, $dest_y);
    imagealphablending($rotate, false);
    switch ($angle) {
        case 270:
            for ($y = 0; $y < $src_y; $y++) {
                for ($x = 0; $x < $src_x; $x++) {
                    $color = imagecolorat($src_img, $x, $y);
                    imagesetpixel($rotate, $dest_x - $y - 1, $x, $color);
                }
            }
            break;
        case 90:
            for ($y = 0; $y < $src_y; $y++) {
                for ($x = 0; $x < $src_x; $x++) {
                    $color = imagecolorat($src_img, $x, $y);
                    imagesetpixel($rotate, $y, $dest_y - $x - 1, $color);
                }
            }
            break;
        case 180:
            for ($y = 0; $y < $src_y; $y++) {
                for ($x = 0; $x < $src_x; $x++) {
                    $color = imagecolorat($src_img, $x, $y);
                    imagesetpixel($rotate, $dest_x - $x - 1, $dest_y - $y - 1, $color);
                }
            }
            break;
        default:
            $rotate = $src_img;
    }
    return $rotate;
}