index.php
<?php session_start();
if(isset($_SESSION['is_login'])){
header('Location:login.php');
exit;
}
if (isset($_POST['submit'])) {
$getUser = $_POST['username'];
$getPass = $_POST['userpass'];
$getCaptcha = $_POST['captcha'];
if($getUser=='demo' && $getPass=='demo' && ($getCaptcha==$_SESSION['captcha_text'])){
$_SESSION['set_user'] = $getUser;
$_SESSION['is_login'] = true;
header('Location:login.php');
exit;
} else {
header('Location:index.php');
exit;
}
} else {
?>
<!DOCTYPE html>
<html>
<head>
<title>Login</title>
<style type="text/css">
*{
font-family: arial;
font-size: 12px;
margin: 2px;
}
</style>
</head>
<body>
<form method="post" action="index.php">
<h3>User Login</h3>
Username : <input type="text" name="username"/><br/><br/>
Password : <input type="text" name="userpass"/><br/><br/>
<img src="captcha.php"/><br/><br/>
<input type="text" name="captcha" placeholder="Type Code" /><br/><br/>
<input type="submit" value="Login" name="submit">
</form>
</body>
</html>
<?php }
?>
login.php
<?php
session_start();
if(!isset($_SESSION['is_login'])){
header('Location:index.php');
exit;
}
?>
<!DOCTYPE html>
<html>
<head>
<title>Welcome Guest</title>
<style type="text/css">
*{
font-family: arial;
font-size: 12px;
}
</style>
</head>
<body>
<h3>Welcome Guest <u><?= $_SESSION['set_user'] ?></u></h3>
<a href="logout.php">Logout</a>
</body>
</html>
captcha.php
<?php
session_start();
$alphabet = "ABCDEFGH";
$captcha_text = "";
for ($i=0; $i < 4; $i++) {
$rand = rand(0,7);
$captcha_text.=substr($alphabet, $rand,1);
}
$_SESSION['captcha_text'] = $captcha_text;
header("Content-Type: image/png");
$im = @imagecreate(110, 20)
or die("Cannot Initialize new GD image stream");
$background_color = imagecolorallocate($im, 0, 0, 0);
$text_color = imagecolorallocate($im, 233, 14, 91);
imagestring($im, 10, 5, 2, $captcha_text, $text_color);
imagepng($im);
imagedestroy($im);
?>
Demo 1
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