我怎么能合并这两个PHP脚本

我有一个jQuery AJAX表单，我想让它在输入上做更好的验证-在PHP端。下面是使用AJAX的PHP脚本:

while (true) {
if (empty($_POST['name'])) {
    $return['error'] = true;
    $return['msg'] = 'You did not enter your name.';
    break;
}
if (empty($_POST['email'])) {
    $return['error'] = true;
    $return['msg'] = 'You did not enter your email.';
    break;
}
if (empty($_POST['message'])) {
    $return['error'] = true;
    $return['msg'] = 'You did not enter your message.';
    break;
}
break;
}
if (!$return['error'])
    $return['msg'] = "Thank you: {$_POST['name']}<br />email address: {$_POST['email']}<br />Your Message: {$_POST['message']}";

echo json_encode($return);

<?php
$subject = "Website Contact Form Enquiry";
//If the form is submitted
if(isset($_POST['submit'])) {
//Check to make sure that the name field is not empty
if(trim($_POST['contactname']) == '') {
    $hasError = true;
} else {
    $name = trim($_POST['contactname']);
}
//Check to make sure sure that a valid email address is submitted
if(trim($_POST['email']) == '')  {
    $hasError = true;
} else if (!eregi("^[A-Z0-9._%-]+@[A-Z0-9._%-]+'.[A-Z]{2,4}$", trim($_POST['email']))) {
    $hasError = true;
} else {
    $email = trim($_POST['email']);
}
//Check to make sure comments were entered
if(trim($_POST['message']) == '') {
    $hasError = true;
} else {
    if(function_exists('stripslashes')) {
        $comments = stripslashes(trim($_POST['message']));
    } else {
        $comments = trim($_POST['message']);
    }
}
//If there is no error, send the email
if(!isset($hasError)) {
    $emailTo = 'info@bgv.co.za'; //Put your own email address here
    $body = "Name: $name 'n'nEmail: $email 'n'nComments:'n $comments";
    $headers = 'From: My Site <'.$emailTo.'>' . "'r'n" . 'Reply-To: ' . $email;
    mail($emailTo, $subject, $body, $headers);
    $emailSent = true;
}
}
?>

请谁知道他们的PHP帮助我-我不知道如何把这个放在一起