PHP邮件工作正常，但放在Wordpress页面时中断

Question

我们有一个很大的php邮件表单，就像它本身使用时的魅力一样。但当我把它放在Wordpress页面中时，邮件程序不再发送（是的，在Wordpress内容中启用了php）。表格通过动议并没有显示任何错误，但它根本不发送电子邮件。显然，有些东西与Wordpress相冲突，我不知道它会是什么。有没有人经历过这个？

我想我可以在必要时发布一些表单代码，但同样，它本身也能正常工作。关于为什么Wordpress会破坏php邮件的任何想法？

    <?php

                    if(!empty($_POST['first-name'])) {

                    $_POST['email'] = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);

                    $agree1 = implode(", ", $_POST['certify-info-true']);
                    $agree2 = implode(", ", $_POST['understand-false-info']);
                    $agree3 = implode(", ", $_POST['final-sig']);

                    foreach($_POST as $name => $value) {
                    $value = filter_var($value, FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_LOW);
                        if($name == 'submit') {
                            //skip
                        }
                        elseif ($name == 'certify-info-true') {
                            $res .= "$name : $agree1 \n \n";
                        }
                        elseif ($name == 'understand-false-info') {
                            $res .= "$name : $agree2 \n \n";
                        }
                        elseif ($name == 'final-sig') {
                            $res .= "$name : $agree3 \n \n";
                        }
                        else {
                        $res .= "$name : $value \n \n";
                        }
                    }

                    //SET here the destination email address and subject line
                    mail('test@email.com','Employment Application', "$res", "From: {$_POST['email']}");

                    //Errors
                    //ini_set( 'display_errors', 1 );
                    //error_reporting( E_ALL );

                    //SET here the thank you message
                    echo "<h2>Thank you for your interest in becoming an employee. If you meet the correct qualifications, we will contact you.</h2>";

                    //print_r($_POST);
                    } else {

                ?>
                <form action="" id="employment" method="POST">

    <!--form snipped-->

    </form>

<?php
        }
    ?>