Contact form using html and php - php

Question

I am trying to create a contact form using html and php, but when I submit the form instead of running the php file it displays the php file on my screen. I do not get any error message. This is my code:
HTML
<div class="container">
<h1>Contact Me</h1>
<div class="well">
<p class="lead">
Do you have any question? Want to write for us? Please use the below contact form and send a message. I'll reply you as quick as possible.
</p>
</div>
<div class="contact-form">
<form method="post" action="form.php" class="form-horizontal col-md-8" role="form">
<div class="form-group">
<label for="name" class="col-md-2">Name</label>
<div class="col-md-10">
<input name="name" type="text" class="form-control" id="name" placeholder="Name">
</div>
</div>
<div class="form-group">
<label for="email" class="col-md-2">Email</label>
<div class="col-md-10">
<input name="email" type="email" class="form-control" id="email" placeholder="Email">
</div>
</div>
<div class="form-group">
<label for="subject" class="col-md-2">Subject</label>
<div class="col-md-10">
<input name="subject" type="subject" class="form-control" id="subject" placeholder="Subject">
</div>
</div>
<div class="form-group">
<label for="message" class="col-md-2">Message</label>
<div class="col-md-10">
<textarea name = "message" class="form-control" id="message" placeholder="Message"></textarea>
</div>
</div>
<label>*What is 2+2? (Anti-spam)</label>
<input name="human" placeholder="Type Here">
<div class="form-group">
<div class="col-md-12 text-right">
<button type="submit" class="btn btn-lg btn-primary">Submit your message!</button>
</div>
</div>
</form>
PHP
<?php
$name = $_POST['name'];
$email = $_POST['email'];
$message = $_POST['message'];
$from = $_POST['email'];;
$to = 'me#mariachavez.co';
$subject = $_POST['subject'];
$body = "From: $name\n E-Mail: $email\n Message:\n $message";
if ($_POST['submit'] && $human == '4') {
if (mail ($to, $subject, $body, $from)) {
echo '<p>Your message has been sent!</p>';
} else {
echo '<p>Something went wrong, you can send an email to me#mariachavez.co and I'll get in touch soon</p>';
}
} else if ($_POST['submit'] && $human != '4') {
echo '<p>You answered the anti-spam question incorrectly!</p>';
}
?>

Answer 1

You can't execute PHP files without server, if you don't have it, you need to install one, for example WAMP or XAMPP.
If you have one, try restarting it, or , if you haven't, configure HTTP server to execute PHP files.