<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);
require_once('../wp-load.php'); 
session_start();
date_default_timezone_set("Asia/Hong_Kong"); 
global $wpdb, $sitepress;

if(isset($_POST["image"]))
{
	$data = $_POST["image"];
	$image_array_1 = explode(";", $data);
	$image_array_2 = explode(",", $image_array_1[1]);

	$data = base64_decode($image_array_2[1]);

    $timestamp = time();
    $hash = md5("WH".$timestamp);
    $file = $timestamp.'.png';

	$imagePath = 'upload/'.$file;
	file_put_contents($imagePath, $data);

    $wpdb->insert('custom_upload_files', ['hash'=>$hash, 'name'=>$file, 'file'=>$file, 'timestamp'=>$timestamp]);

	echo $hash;
}

?>