Update.php

<?php

    $uname = $_POST['username'];
    $mail = $_POST['mail'];

    //MySQLi Query
    $con = mysqli_connect("localhost","root","","mscit");

    if(!$con)
    {
        die("Error :".mysqli_error());
    }
    else
    {
        //none
    }

    //delete from login where username=7842;
    $dbq = "update login set email='$mail' where username='$uname'";

    mysqli_query($con, $dbq);

    echo "<p align='center'> Record Updated.";

    //echo "Record Updated : ".mysql_affected_rows($con);

?>