在html + php中发送邮件功能

Question

当用户填写完HTML表单然后通过电子邮件发送表单中的信息时，我想发送一封包含PHP的电子邮件。我有以下代码，但没有在邮件中获取表单值。有人可以帮我这个吗？

<form id="main-contact-form" class="contact-form" name="contact-form" method="post" action="sendemail.php" role="form">
                    <div class="row">
                        <div class="col-sm-5">
                            <div class="form-group">
                                <input type="text" class="form-control" required="required" placeholder="First Name" name="name">
                            </div>
                            <div class="form-group">
                                <input type="text" class="form-control" required="required" placeholder="Last Name" name="lname">
                            </div>
                            <div class="form-group">
                                <input type="text" class="form-control" required="required" placeholder="Email address" name="email">
                            </div>
                            <div class="form-group">
                                <button type="submit" class="btn btn-primary btn-lg" name="submit">Send Message</button>
                            </div>
                        </div>
                        <div class="col-sm-7">
                            <textarea name="message" id="message" required="required" class="form-control" rows="8" placeholder="Message"></textarea>
                        </div>
                    </div>
                </form>


**sendemail.php**

<?php
    header('Content-type: application/json');
    $status = array(
        'type'=>'success',
        'message'=>'Email sent!'
    );


    $name = @trim(stripslashes($_POST['name'])); 
    $email = @trim(stripslashes($_POST['email'])); 
    $subject = "Mail from your website"; 
    $message = @trim(stripslashes($_POST['message'])); 

    $email_from = $email;
    $email_to = 'manish22it@gmail.com';

    $body = 'Name: ' . $name . "\n\n" . 'Email: ' . $email . "\n\n" . 'Subject: ' . $subject . "\n\n" . 'Message: ' . $message;

    $success = @mail($email_to, $subject, $body, 'From: <'.$email_from.'>');

    echo json_encode($status);
    die;
?>