将GIF代码转换为GIF图像或输出到文件？ [关闭]

Question

I'm not exactly sure how to word this so apologies if the title is misleading. I'm using UPS's web service to create a shipping label, this is returned as a GIF, but not as an image, instead as a long code:

R0lGODdheAUgA+cAAAAAAAEBAQICAgMDAwQEBAUFBQYGBgcHBwgICAkJCQoKCgsLCwwMDA0NDQ4ODg8PDxAQEBERERISEhMTExQUFBUVFRYWFhcXFxgYGBkZGRoaGhsbGxwcHB0dHR4eHh8fHyAgICEhISIiIiMjIyQkJCUlJSYmJicnJygoKCkpKSoqKisrKywsLC0tLS4uLi8vLzAwMDExMTIyMjMzMzQ0NDU1NTY2Njc3Nzg4ODk5OTo6Ojs7Ozw8PD09....... (etc)

My question is how do I use this to get an actual GIF image? preferably to output to file, and using either JavaScript or PHP.

Thanks in advance!

Answer 1

The string looks like base64-encoded data. Assuming it is, in fact, an image then you can decode it like this:

$encodedGif = 'R0lGODdheAUgA+cAAAAAAAEBAQICAgMDAwQEBAUFBQYGBgcHBw...';
$decodedGif = base64_decode($encodedGif, true);
if ($decodedGif === false) {
    die('Data has been corrupted. Unable to decode.');
}

Once you have the decoded data you can e.g. save it to a file:

$file = 'image.gif';
if ( ! file_put_contents($file, $decodedGif)) {
    die('Saving image did not work!');
}

Or you can output it to a browser as a GIF image:

header('Content-Type: image/gif');
die($decodedGif);