How do I stop the Phantom Emails from my PHP code? - php

Question

I'm currently using an html5 website with a contact form and a php action to receive contact emails. I've tried a few different codes in my php but non have stopped the blank emails from coming. I do have google analytics enables on my code but have blocked the crawler through robot.txt. Here is my code.
PHP CODE
<?php
foreach ($_GET as $Field=>$Value) {
if($Value != ''){
$body .= "$Field: $Value\n";
}
}
$name = trim(htmlentities($_GET['name'],ENT_QUOTES,'utf-8'));
$email = trim(htmlentities($_GET['email'],ENT_QUOTES,'utf-8'));
$phone = trim(htmlentities($_GET['phone'],ENT_QUOTES,'utf-8'));
$messages = trim(htmlentities($_REQUEST['messages'],ENT_QUOTES,'utf-8'));
if (strlen($name) == 0 )
{
echo "<script>window.location = 'http://www.mason372.org/error.html'</script>";
}
if (strlen($email) == 0 )
{
echo "<script>window.location = 'http://www.mason372.org/error.html'</script>";
}
$to = "junior.8791#gmail.com";
$message = "Name: ".$name;
$message.="\n\nEmail: ".$email;
$message.="\n\nPhone: ".$phone;
$message .= "\n\nMessage: ".$messages;
$headers = "From: $email";
$headers .="\nReply-To: $email";
$success = mail($to, $subject, $message, $headers);
if ($success) {
echo "<script>window.location = 'http://www.mason372.org/thankyou.html'</script>";
} else {
echo "<script>window.location = 'http://www.mason372.org/error.html'</script>";
}
?>
CONTACT FORM
<form action="email.php" method="post" id="form">
<div class="5grid">
<div class="row">
<div class="6u">
<input type="text" class="name" name="name" id="name" placeholder="Name" value="" aria-describedby="name-format" required aria-required=”true” pattern="[A-Za-z-0-9]+\s[A-Za-z-'0-9]+" title="e.g.'John Doe'" required="" />
</div>
<div class="6u">
<input type="email" class="email" name="email" id="email" placeholder="Email" required="" />
</div>
</div>
<div class="row">
<div class="12u">
<input type="tel" class="tel" name="phone" id="phone" name="phone" type="text" placeholder="Phone Number" pattern="(?:\(\d{3}\)|\d{3})[- ]?\d{3}[- ]?\d{4}" required />
</div>
</div>
<div class="row">
<div class="12u">
<textarea name="messages" id="messages" placeholder="Message"></textarea>
</div>
</div>
<div class="row">
<div class="12u">
<input type="submit" class="button" value="Send Message">
<input type="reset" class="button button-alt" value="Clear Form">