使用php isset将表单发送到电子邮件不起作用

Question

我目前有一些php，可在完成时将表格发送给电子邮件。问题是，我希望在必须选择两个选项而不是所有选项时提交表单。

该表单是具有5个选项的基本输入表单，其中2个是必需的。

<?php
///I thought this would work since I'm only requesting two inputs V
if (isset($_POST['optionOne']) && isset($_POST['option'])){

    $optionOne=$_POST['optionOne'];
    $tick=$_POST['tick'];
    $results=$_POST['results'];
    $option=$_POST['option'];
    $requirements=$_POST['requirements'];

    $to= "bonniethompson12345@gmail.com";
    $subject="submit";
    $body="This course is identified in my Work Plan and Learning Agreement: $optionOne \n \n I am attending this session because: $tick \n \n What would you like to achieve as a result of your attendance: $results \n \n Do you require adjustments or additions to the session delivery to support your participation: $option \n \n Please provide details of your requirments: $requirements";

    $send = mail($to, $subject, $body);
    if ($send) {
        echo 'message sent!';
    }else {
        echo "error";
    }
}
?>