为什么我的PHP文件会产生500错误？

Question

我刚刚更新了网站的联系表格，但我不断收到500错误代码。我的PHP文件中是否有引发此错误的错误？

我正在为我母亲的玫琳凯部门的着陆页工作，并且刚刚更新了联系表。但是，我已确保重定向正常工作，并注释掉了额外的$ msg变量，该变量显示为“文本的第一行...”

<?php

    if(isset($_POST['contact_form_submit'])){
    //if the page does have post data, process it

    //gather post data
    $contactName = striptags(trim(htmlspecialchars($_POST['contact_name'])));
    $contactEmail = striptags(trim(htmlspecialchars($_POST['contact_email'])));
    $contactMessage = striptags(trim(htmlspecialchars($_POST['contact_message'])));

    //Create the email message
    $msg = "You have received a message from: ".$contactName.", ".$contactEmail.", Message = ".$contactMessage;

    //the message
    //$msg = "First line of text\nSecond line of text";

    //use wordwrap() if lines are longer than 70 characters
    $msg = wordwrap($msg,70);

    //send email
    //omitting my email address
    mail("example@gmail.com","New Contact Form Submission",$msg);
    echo 'Email has been sent.';
    //if message successful, redirect user to thank you page
    header('Location: https://adenaharper.com/thank-you');

    } else {
        //kick the user from the page
        echo 'Peace out!';
    } 

?>

我希望表单提交到我的电子邮件地址，但是给了我500错误代码。