I want to decode base64 encoded data which is image/gif? How can I do that in php?

Question

I am using the below code from the library https://github.com/antimatter15/jsgif. I tried to convert the code given below to a gif image file but could not achieve it.

    var encoder = new GIFEncoder();
            encoder.setRepeat(0);
            encoder.start();
            var st = '|100:167.1,D,Pencil,3,#000|100:167.1,U|100:167.1,D|102:163.1,M|135:125.1|206:97.1|289:99.1|323:134.1|3\
16:252.1|205:331.1|234:260.1|504:102.1|581:92.1|631:95.1|635:132.1|512:209.1,U|385:29.1,D,,,#66c|384:29.1,M|384:40.1|378:84.\
1|365:168.1|360:215.1|354:269.1|354:300.1|357:313.1|405:319.1|450:314.1|507:291.1|546:260.1|534:223.1|487:171.1|418:119.1|29\
0:131.1|220:201.1|168:284.1|157:339.1|170:353.1|256:308.1|348:212.1|390:118.1|399:77.1|397:68.1|298:82.1|176:168.1|90:265.1|\
70:290.1|70:292.1|250:150.1|465:14.1|594:-42.9|606:-39.9|550:29.1|442:170.1|335:322.1|258:430.1|258:430.1,U';
            var frames_array = st.split('|');
            $.each(frames_array,function(index,value) {
               encoder.addFrame(value);
                });
            encoder.finish();
            var binary_gif = encoder.stream().getData();
            var data_url = 'data:image/gif;base64,'+encode64(binary_gif);

What I get for data_url is as given below

data:image/gif;base64,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‏

I need to convert this encoded code to an gif image file. How can I achieve it further

$pic = 'sample.gif'; $org_upload_path = "./upload/"; $image_location = $org_upload_path.$pic; file_put_contents("$image_location", base64_decode($img)); — kamlesh.bar, Apr 07 '15 at 10:39
Thanks, @kamlesh.bar but I am using the above code in js which is base_64 encoded and I can pass that to php but I dont have any idea of how I can convert that to an image file, can u please help me out with a code which will convert base64_encoded string into image gif? — harshal, Apr 07 '15 at 10:41
as i mention above to convert encoded string into file you can just do file_put_contents("upload/sample.gif", base64_decode($img)); http://stackoverflow.com/questions/15153776/convert-base64-string-to-an-image-file — kamlesh.bar, Apr 07 '15 at 10:43

score 1 · Answer 1 · answered Apr 07 '15 at 10:44

1

try this , may this will help you

<?php
function base64url_decode($data) {
return base64_decode(str_pad(strtr($data, '-_', '+/'), strlen($data) % 4,     '=', STR_PAD_RIGHT));
}
?>

answered Apr 07 '15 at 10:44

anand kulkarni

156
1
12

score 1 · Answer 2 · edited May 23 '17 at 10:24

1

Use this (PHP pseudo-code): http://php.net/manual/en/function.imagecreatefromstring.php

function imagegif_from_base64($base64)
{
    return imagecreatefromstring(base64_decode(substr($base64, 22) /* remove the "data:image/gif;base64," string */));
}

related get image from base64 string

edited May 23 '17 at 10:24

Community

1
1

answered Apr 07 '15 at 10:48

Nikos M.

8,033
4
36
43

kamlesh.bar · Answer 3 · 2015-04-07T11:01:11.517

AS you are using jsgif library you You can do like this to decode image

    $imgstr = 'data:image/gif;base64,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‏';
    $new_data=explode(";",$imgstr);
    $type=$new_data[0];
    $imgdata=explode(",",$new_data[1]);
    $imgstr = base64_decode($imgdata[1]);

    // or choose any name instead sample.gif
    file_put_contents("sample.gif", base64_decode($imgstr));

score 0 · Answer 4 · answered Apr 07 '15 at 11:16

If you just wanna use PHP try this:

$str = 'data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAA...';
$data = str_replace('data:image/gif;base64,', '', $str);
$data = str_replace(' ', '+', $data);

$data = base64_decode($data); // base64 decoded image data
$source_img = imagecreatefromstring($data);
$file = uniqid() .'.gif';
$success = file_put_contents($file, $data);

This will save the .gif image in the same folder the php file is located.

I want to decode base64 encoded data which is image/gif? How can I do that in php?

4 Answers4