验证表单中可选字段的正确方法

Question

我有一个带有验证的联系表（如果我有一个可选字段），如果用户确实填写了，我希望将其通过电子邮件发送出去。这样简单地扔进去就可以了吗？

$found = $_POST['found'];

这是我的表格：

<?php

$errors         = array();      // array to hold validation errors
$data           = array();         // array to pass back data

// validate the variables ======================================================
    // if any of these variables don't exist, add an error to our $errors array

    if (empty($_POST['firstName']))
        $errors['firstName'] = 'First Name is required.';

    if (empty($_POST['lastName']))
        $errors['lastName'] = 'Last Name is required.';

    if (empty($_POST['companyName']))
        $errors['companyName'] = 'Company Name is required.';

    if (empty($_POST['companyAddress']))
        $errors['companyAddress'] = 'Company Address is required.';

    if (empty($_POST['city']))
        $errors['city'] = 'City is required.';

    if (empty($_POST['state']))
        $errors['state'] = 'State is required.';

    if (empty($_POST['emailAddress'])) {
        $errors['emailAddress'] = 'Email Address is required.';
    } else {
        $emailAddress = filter_var($errors['emailAddress'], FILTER_SANITIZE_EMAIL);
        if (!filter_var($emailAddress, FILTER_VALIDATE_EMAIL)) {
            $errors['emailAddress'] = 'Email Address is invalid.';
        }
    }

    if (empty($_POST['comment']))
        $errors['comment'] = 'Comment is required.';

    if (empty($_POST['g-recaptcha-response']))
        $errors['recaptcha'] = 'Captcha is required.';


// return a response ===========================================================

    // Check ReCaptcha Validation

    if(!validateRecaptcha($secret, $_POST['g-recaptcha-response'], $_SERVER["REMOTE_ADDR"]))
    {
        $errors['recaptcha'] = 'Captcha is required.';
    }

    if ( ! empty($errors)) {

        // if there are items in our errors array, return those errors
        $data['success'] = false;
        $data['errors']  = $errors;
    } else {

        // if there are no errors process our form, then return a message

        // DO ALL YOUR FORM PROCESSING HERE
        // THIS CAN BE WHATEVER YOU WANT TO DO (LOGIN, SAVE, UPDATE, WHATEVER)

        // show a message of success and provide a true success variable
        $data['success'] = true;
        $data['message'] = 'Success!';
    }

    // return all our data to an AJAX call
    if ($errors) {
        $data['success'] = false;
        $data['errors']  = $errors;
    } else {

//Begin of send email

?>

还是有另一种更合适的方法来实现这一目标？

我的目标是保持组织和风格不变。

该脚本执行服务器端验证，并用javascript打印出所有错误，并根据反馈对表单进行必要的CSS / HTML更改。显然，这使用JSON / AJAX来传达错误。

“已找到”字段是一个可选字段，与其余字段不同。