Css3切换开关未在电子邮件联系表单上发布PHP [关闭]

This switch is part of a form, I can't get this element to be posted by the PHP into email, It seems to be not picking up the checked with the data-on="Yes" data-off="No" attribute of the switch.

HTML

<form class="booking-form" name="bookchalet" action="booking_form.php"  method="post"> 
    <div id="switchbox">
        <div class="switch">
            <input id="cmn-toggle-1" class="cmn-toggle cmn-toggle-round" type="checkbox"/>
            <label for="cmn-toggle-1"></label>
        </div>
        <div class="switch">
            <input id="cmn-toggle-4" class="cmn-toggle cmn-toggle-round-flat" type="checkbox"/>
            <label for="cmn-toggle-4"></label>
        </div>
        <div class="switch">
            <input id="cmn-toggle-7" class="cmn-toggle cmn-toggle-yes-no" name="apartment" type="checkbox"/>
            <label for="cmn-toggle-7"  data-on="Yes" data-off="No" ></label>
        </div>
    </div>
    </li>   
</form> 

PHP

<?php
    if ($_POST["submit"]){
        $apartment = $_POST['apartment'];
        $submit = $_POST['submit'];
        $to = 'myemail@email.com';
        $headers = 'From: website' . "
";
        $subject =  'FORM: '.$submit. "
";
        $message =  ' Booking Details: '.$submit.', With apartment?:'.$apartment.."
";

        mail($to, $subject, $message, $headers); //This method sends the mail.
        echo "Your email was sent!"; // success message
        $url = 'index.html';
        echo '<META HTTP-EQUIV=Refresh CONTENT="0; URL='.$url.'">';  
    }
    }
?>

I have taken out other elements of the form as it was pretty long and they were posting to email correctly.

In your .php code I do not see any connection to your database and/or an insertion statement. . . Code that would look like this:

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
 die("Connection failed: " . $conn->connect_error);
} 

$sql = "INSERT INTO MyGuests (firstname, lastname, email)
 VALUES ('John', 'Doe', 'john@example.com')";

if ($conn->query($sql) === TRUE) {
echo "New record created successfully";
} else {
echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();
?>