I have a base64 encoded png, how do I write the image to a file in PHP?

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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.

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