Здравствуйте.
Нужен взгляд профессионалов.
Есть код загрузки изображений.
Достаточно ли проверок для безопасной загрузки на сервер?

$imgUrl = $_POST['imgUrl'];
$imgInitW = $_POST['imgInitW'];
$imgInitH = $_POST['imgInitH'];
$imgW = $_POST['imgW'];
$imgH = $_POST['imgH'];
$imgY1 = $_POST['imgY1'];
$imgX1 = $_POST['imgX1'];
$cropW = $_POST['cropW'];
$cropH = $_POST['cropH'];
$angle = $_POST['rotation'];

$jpeg_quality = 90;

$output_filename = "temp/".time()."_".rand(100,999);

$what = getimagesize($imgUrl);

if($what['0'] < "100"){
die();
}
if($what['1'] < "100"){
die();
}

switch(strtolower($what['mime']))
{
    case 'image/png':
        $img_r = imagecreatefrompng($imgUrl);
		$source_image = imagecreatefrompng($imgUrl);
		$type = '.png';
        break;
    case 'image/jpeg':
        $img_r = imagecreatefromjpeg($imgUrl);
		$source_image = imagecreatefromjpeg($imgUrl);
		error_log("jpg");
		$type = '.jpeg';
        break;
    case 'image/gif':
        $img_r = imagecreatefromgif($imgUrl);
		$source_image = imagecreatefromgif($imgUrl);
		$type = '.gif';
        break;
    default: die('image type not supported');
}

if(!is_writable(dirname($output_filename))){
	$response = Array(
	    "status" => 'error',
	    "message" => 'Can`t write cropped File'
    );	
}else{
    $resizedImage = imagecreatetruecolor($imgW, $imgH);
	imagecopyresampled($resizedImage, $source_image, 0, 0, 0, 0, $imgW, $imgH, $imgInitW, $imgInitH);
    $rotated_image = imagerotate($resizedImage, -$angle, 0);
    $rotated_width = imagesx($rotated_image);
    $rotated_height = imagesy($rotated_image);
    $dx = $rotated_width - $imgW;
    $dy = $rotated_height - $imgH;
	$cropped_rotated_image = imagecreatetruecolor($imgW, $imgH);
	imagecolortransparent($cropped_rotated_image, imagecolorallocate($cropped_rotated_image, 0, 0, 0));
	imagecopyresampled($cropped_rotated_image, $rotated_image, 0, 0, $dx / 2, $dy / 2, $imgW, $imgH, $imgW, $imgH);
	$final_image = imagecreatetruecolor($cropW, $cropH);
	imagecolortransparent($final_image, imagecolorallocate($final_image, 0, 0, 0));
	imagecopyresampled($final_image, $cropped_rotated_image, 0, 0, $imgX1, $imgY1, $cropW, $cropH, $cropW, $cropH);
	imagejpeg($final_image, $output_filename.$type, $jpeg_quality);
	$response = Array(
	    "status" => 'success',
	    "url" => $output_filename.$type
    );
imagedestroy($final_image);
}
print json_encode($response);