how to apply boolean data into database usign mysql and php?

when i checked and not checked the employed checkbox it gives only 0 in the database. how do i fix it?

this is my php code block.

$conn = mysqli_connect('localhost','','','login');

    $name=$_POST['name'];
    $pword=$_POST['pword'];
    $type=$_POST['type'];
    $chk=$_POST['chk'];



    $sql="insert into login(name,password,type,employed)values('$name','$pword','$type','$chk')";

    mysqli_query($conn,$sql);

    mysqli_close($conn);

echo "successfully inserted.<br/>";
print "<a href='student.php'>Back</a>";