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两年前关门了。
我正在尝试将数据保存到我的远程mysql数据库。我在 Postman 身上测试了这个脚本。但它给出了这个错误 {"error":true,"message":"Please try later"} 我尝试了不同的插入方法。但我认为主要是500个内部服务器错误。我该怎么修？

<?php

define('DB_HOST','**.**.***.***');
define('DB_USERNAME','*******');
define('DB_PASSWORD','*******');
define('DB_NAME', '*******');

//Connecting to the database
$conn = new mysqli(DB_HOST, DB_USERNAME, DB_PASSWORD, DB_NAME);

if($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

$response = array();

if($_SERVER['REQUEST_METHOD']=='POST'){

    $emoji = $_POST['emoji'];
    $comment = $_POST['comment'];
    $date = $_POST['date'];

    $stmt = $conn->prepare("INSERT INTO datas (emoji, comment, date) VALUES (?, ?, ?)");

    $stmt->bind_param("sss", $emoji, $comment, $date);

    if($stmt->execute()){
        //making success response 
        $response['error'] = false;
        $response['message'] = 'Name saved successfully';
    }else{
        //if not making failure response 
        $response['error'] = true;
        $response['message'] = 'Please try later';
    }

}else{
    $response['error'] = true;
    $response['message'] = "Invalid request";
}

echo json_encode($response);