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What's the proper way in PHP to create an image file (PNG), when I have the base64 encoding?

I've been playing around with:


file_put_contents('/tmp/'. $_REQUEST['id'].'.png', $_REQUEST['data']);

do I need to decode? should I be using the gd library?

mmattax
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3 Answers3

64

You need to use base64_decode(). AND. Sometimes it is not sufficient. Here is all code that you need:

$img = $_POST['data'];
$img = str_replace('data:image/png;base64,', '', $img);
$img = str_replace(' ', '+', $img);
$fileData = base64_decode($img);
//saving
$fileName = 'photo.png';
file_put_contents($fileName, $fileData);

P.S. I used this code to get PNG image from html canvas.

Yevgeniy Afanasyev
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    Is it possible to validate this image data? like normally you will validate all sorts of things before uploading the image – ii iml0sto1 Sep 19 '20 at 13:30
37

My best guess is that you simply need to call base64_decode() on $_REQUEST['data'] before writing it to the file. That should be plenty enough :).

Thibault Martin-Lagardette
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6

I would think you'd want to decode with base64_decode() unless you are only using it like they are here HERE.

The thing I am sure of is that you will want to sanitize $_REQUEST['id'] before using it.

Chris Kloberdanz
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