Jak zmienić rozmiar obrazka w PHP?

$oldFile = „testpicture.jpg”; $newFile = „NEW_testpicture.jpg”; $percent = 0.5; list($width, $height) = getimagesize($oldFile); $newWidth = $width * $percent; $newHeight = $height * $percent; $thumb = imagecreatetruecolor($newWidth, $newHeight); $source = imagecreatefromjpeg($oldFile); imagecopyresized($thumb, $source, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height); imagejpeg($thumb, $newFile);