Почему моя форма POST переносит меня на новую страницу?

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У меня есть простая форма HTML, которая указывает на PHP-скрипт, который отправит электронное письмо.

проблема

Когда я нажимаю кнопку отправки, отправляется электронное письмо, но я беру его на URL-адрес PHP.

Я пробовал все TARGET = "_ self" в объявлениях, но я все еще был взят на новую страницу.

Код HTML CODE

<form name="contactform" method="post" action="send_form_email1.php">
    <table width="450px">
        <tr>
            <td>
                <input type="text" placeholder="Full Name" name="full_name"/>
            </td>
        </tr>
        <tr>
            <td>
                <input type="text" placeholder="Email Address" name="email"/>
            </td>
        </tr>
        <tr>
            <td>
                <input type="text" placeholder="Phone Number" name="telephone"/>
            </td>
        </tr>
        <tr>
            <td>
                <input type="text" placeholder="Question" name="comments"/>
            </td>
        </tr>
        tr>
                 <td colspan="2" style="text-align:center">
                <input type="submit" value="Submit" > 
            </td>
        </tr>
    </table>
</form>

PHP скрипт

// EDIT THE 2 LINES BELOW AS REQUIRED
 // EDIT THE 2 LINES BELOW AS REQUIRED
$email_to = "[email protected]";
$email_subject = "Your email subject line";


function died($error) {
    // your error code can go here
    echo "We are very sorry, but there were error(s) found with the form you submitted. ";
    echo "These errors appear below.<br /><br />";
    echo $error."<br /><br />";
    echo "Please go back and fix these errors.<br /><br />";
    die();
}

// validation expected data exists
if(!isset($_POST['full_name']) ||
    !isset($_POST['email']) ||
    !isset($_POST['telephone']) ||
    !isset($_POST['comments'])) {
    died('We are sorry, but there appears to be a problem with the form you submitted.');       
}

$full_name = $_POST['full_name']; // required
$email_from = $_POST['email']; // required
$telephone = $_POST['telephone']; // not required
$comments = $_POST['comments']; // required

$error_message = "";
$email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
if(!preg_match($email_exp,$email_from)) {
$error_message .= 'The Email Address you entered does not appear to be valid.<br />';
}
$string_exp = "/^[A-Za-z .'-]+$/";
if(!preg_match($string_exp,$full_name)) {
$error_message .= 'The First Name you entered does not appear to be valid.<br />';
}
if(strlen($comments) < 2) {
$error_message .= 'The Comments you entered do not appear to be valid.<br />';
}
if(strlen($error_message) > 0) {
died($error_message);
}
$email_message = "Form details below.\n\n";

function clean_string($string) {
  $bad = array("content-type","bcc:","to:","cc:","href");
  return str_replace($bad,"",$string);
}

$email_message .= "Last Name: ".clean_string($last_name)."\n";
$email_message .= "Email: ".clean_string($email_from)."\n";
$email_message .= "Telephone: ".clean_string($telephone)."\n";
$email_message .= "Comments: ".clean_string($comments)."\n";

// create email headers
$headers = 'From: '.$email_from."\r\n".
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' . phpversion();
 @mail($email_to, $email_subject, $email_message, $headers);  
?>


<?php
}
?>

Любая помощь приветствуется.