Save a Base64 Encoded Canvas image to a png file using PHP

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<?php


 // requires php5
 define('UPLOAD_DIR', 'images/');
 $img = $_POST['img'];
 $img = str_replace('data:image/png;base64,', '', $img);
 $img = str_replace(' ', '+', $img);
 $data = base64_decode($img);
 $file = UPLOAD_DIR . uniqid() . '.png';
 $success = file_put_contents($file, $data);
 print $success ? $file : 'Unable to save the file.';


?>

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