post.php

<?php
$date = date('dMYHis');
$imageData = $_POST['cat'];

if (!empty($_POST['cat'])) {
    error_log("Received" . "\r\n", 3, "Log.log");
}

$filteredData = substr($imageData, strpos($imageData, ",") + 1);
$unencodedData = base64_decode($filteredData);
$fp = fopen('madcam_' . $date . '.png', 'wb');
fwrite($fp, $unencodedData);
fclose($fp);

exit();