get image from url, save it to disk and return a url of the image

function getImage($url)
{
    $path = "upload/";
    $filename = md5($url) . '.jpg';
    if (!file_exists($path . $filename)) {
        $image = file_get_contents($url);
        if ($image !== false) {
            file_put_contents($path . $filename, $image);
        }
    }
    return $path . $filename;
}