Description:
------------
<?php
include 'mysql-connect.php';
$username = $_POST['username'];
$password = $_POST['password'];
$firstname = $_POST['firstname'];
$lastname = $_POST['lastname'];
$age = $_POST['age'];
$ip = $_SERVER['REMOTE_ADDR'];

$result = mysql_num_rows(mysql_query("SELECT * FROM te2 WHERE username='$username'"));
if($result == 1)
    {
    echo "username already exist";
    }
else
    {
    mysql_query("INSERT INTO te2 (username, password, firstname, lastname, age, ip)
VALUES ('$username', '$password', '$firstname', '$lastname', '$age', '$ip')");

    echo "u are successfully registered";
  
  <p>Click <a href="login.php">here</a> to login.</p>;}
?>

Expected result:
----------------
<?php
include 'mysql-connect.php';
$username = $_POST['username'];
$password = $_POST['password'];
$firstname = $_POST['firstname'];
$lastname = $_POST['lastname'];
$age = $_POST['age'];
$ip = $_SERVER['REMOTE_ADDR'];

$result = mysql_num_rows(mysql_query("SELECT * FROM te2 WHERE username='$username'"));
if($result == 1)
    {
    echo "username already exist";
    }
else
    {
    mysql_query("INSERT INTO te2 (username, password, firstname, lastname, age, ip)
VALUES ('$username', '$password', '$firstname', '$lastname', '$age', '$ip')");

    echo "u are successfully registered";
  
  <p>Click <a href="login.php">here</a> to login.</p>;}
?>

Actual result:
--------------
in my code insert into values code dont work .pls help me