api.php

<?php
server();
function server()
{
    $data = [];
    if (!isset($_GET['action'])) {
        return;
    }
    switch ($_GET['action']) {
        case 'upload':
            $data = ['data' => []];
            $files = $_FILES['files'];
            if (!is_array($files) || empty($files)) {
                return;
            }
            foreach ($files['tmp_name'] as $k => $v) {
                $path = "/uploads/{$files['name'][$k]}";
                move_uploaded_file($v, "." . $path);
                $data['data'][] = "http://{$_SERVER['HTTP_HOST']}{$path}";
            }
            break;
        case 'save':
                file_put_contents("./data.json", file_get_contents("php://input"));
                die('ok');
            break;
        case 'load':
            $data = json_decode(file_get_contents("./data.json"));
            break;
    }
    echo json_encode($data);
}