PHP - online image convert to base64

$url = 'http://yoursite.com/image.jpg';
$image = file_get_contents($url);
if ($image !== false){
    return 'data:image/jpg;base64,'.base64_encode($image);

}

관련 URL 
: https://stackoverflow.com/questions/4343715/php-how-to-convert-an-image-from-url-to-base64