dsg7513 2014-11-11 11:51
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将GIF代码转换为GIF图像或输出到文件? [关闭]

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!

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  • dounie0889 2014-11-11 12:00
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    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);
    
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