simpan program dengan nama login.php
<?php
session_start();
if ( isset( $_POST["login"]) ) {
login();
} elseif ( isset ( $_GET["action"]) and $_GET["action"] == "logout") {
logout();
}elseif ( isset ( $_SESSION["username"])) {
displayPage();
}else{
displayLoginForm();
}
function login(){
$username = "khalid";
$passwd = "12345";
if (isset ( $_POST["username"]) and isset ($_POST["password"])) {
echo $_POST ["username"];
if ($_POST["username"] == $username and $_POST["password"] == $passwd ){
$_SESSION["username"] = $username;
session_write_close();
header("Location : login.php");
}else{
displayLoginForm ("username/password Tidak cocok");
}
}
}
function logout(){
unset($_SESSION["username"]);
session_write_close();
header("Location: login.php");
}
function displayPage(){
displayPageHeader();
?>
<p>Welcome, <strong><?php echo $SESSION["username"] ?></strong> Anda sudah Berhasil Login.</p>
<p><a href="login.php?action=logout">Logout</a></p>
</body>
</html>
<?php
}
function displayLoginForm($message=""){
displayPageHeader();
?>
<?php if($message)
echo '<p class="error">' . $message . '</p>';
?>
<form action="login.php" method="post">
<div style= "width: 30em;">
<label for = "username">Username</label>
<input type="text" name="username" id="username" value=""/>
<label for="password">Password</label>
<input type="password" name="password" id="password" value=""/>
<div style="clear: both;">
<input type="submit" name="login" value="Login"/>
</div>
</div>
</form>
</body>
</html>
<?php
}
function displayPageHeader(){
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml/DTD/xhtml-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="on" lang="on">
<head>
<title> A Login Form</title>
<link rel="stylesheet" type="text/css" href="common.css" />
<style type="text/css">
.error{ background: #d33; color: white; padding: 0.2em; }
</style>
</head>
<body>
<h1>Silahkan Login</h1>
<?php
}
?>
simpan program berikut dengan nama common.css
/*Page Body */
body {font-family : Arial,helvetia,sans-serif;}
/*definition lists*/
dl {
width:100%;
margin:2em 0;
padding: 0;
clear: both;
overflow:auto;
}
dt {
width:30%;
float : left ;
margin:0;
padding: 5px 9.9% 5px 0; 0
order-top:1px solid #DDDDB7;
font-weight:bold;
overflow:auto;
clear:left;
}
dd {
width : 60%;
float :left;
margin:0;
padding:6px 0 5px 0;
border-top:1px solid #DDDDB7;
overflow:auto;
}
/*headings*/
h1{
font-weight:bold;
margin:35px 0 14px;
color:#666;
font-size:1.5em;
}
h2{
font-weight:bold;
margin:30px 0 12px;
color:#666;
font-size:1.3em;
}
h3{
font-weight:normal;
margin:30px 0 12px;
color:#666;
font-size:1.2em;
}
h4{
font-weight:bold;
margin:25px 0 12px;
color:#666;
font-size:1.0em;
}
h5{
font-weight:bold;
margin:25px 0 12px;
color:#666;
font-size:0.9em;
}
/*form*/
label { display:block;
float:left;
clear:both;
text-align:right;
margin:0.6em 5px 0 0;
width: 40%;
}
input,select,textarea {
float:right;
margin:1em 0 0 0;
width:57%;
}
input {
border:1px solid #666;
}
input[type=radio], iinput[type=checkbox],input[type=submit],input[type=reset],input[type=button],input[type=image]{
width:auto;
}
maka outputnya akan seperti berikut:
Tampilan untuk login awal
output nya. login form :
output jika password sama dan benar :
output jika passwordnya salah :
