Function to save base64 image to png in PHP

base64-png.php

<?php
function base64_png($data, $filename) {
	$img	= str_replace('data:image/png;base64,', '', $data);
	$img	= str_replace(' ', '+', $img);
	$data	= base64_decode($img);

	return file_put_contents($filename, $data);
}

$filename = __DIR__ . '/' . uniqid() . '.png';
$save = base64_png($_POST['data'], $filename);
echo $save ? 'File saved!' : 'Unable to save file.';
?>