<?php
    header('Content-Type: application/json; charset=utf-8');
    $file = "dynamic-data.json";
    if (isset($_GET['reset']) && $_GET['reset']) {
        $resetfile = "test-data.json";
        file_put_contents($file, file_get_contents($resetfile));
    }
    if (isset($_POST['data'])) {
        file_put_contents($file, $_POST['data']);
        echo json_encode(array("result" => "OK"));
    } else {
        echo file_get_contents($file);
    }
?>