Login – Logout dengan Session dalam 1 file


Membuat file untuk Login dan Logout (PHP + MySQL) dengan menggunakan SESSION variabel. File ini berisi script Login form, Login authorize program and Logout program. File ini berisi formulir Login, Login otorisasi dan Keluar Program. All in one but Short and Easily. Semua dalam satu tetapi Singkat dan mudah.

This tutorial require 2 PHP files and 1 table of mySQL database. Tutorial ini memerlukan PHP 2 file dan 1 tabel mySQL database.

1. index.php this file is the Login and Logout file. index.php file ini adalah file Login dan Logout.
2. main.php this file is the target when login is OK main.php file ini adalah target ketika login OK
3. Database “tutorial” and table “admin” with 3 fields: id(auto_increment), username(varchar, 50), password(varchar, 32). Database “tutorial” dan tabel “admin” dengan 3 kolom: ID (auto_increment), username (varchar, 50), password (varchar, 32).
* The “password” field is design for md5() password for more sucurity. * The “password”, adalah bidang desain untuk md5 () password untuk lebih sucurity.

What is md5() function? Click here. Apakah md5 () function? Klik di sini.

Then put a record into this table. Kemudian dimasukkan ke dalam catatan tabel ini. In this tutorial, put a record with name ” admin ” and password ” 81dc9bdb52d04dc20036dbd8313ed055 “. Dalam tutorial ini, masukkan record dengan nama “admin” dan password “81dc9bdb52d04dc20036dbd8313ed055″. This password was encrypted by md5() function from the real password ” 1234 “. Ini adalah password yang dienkripsi oleh md5 () fungsi dari real password “1234”.

* When you test this script you must to put the real password (1234) in “password” box. * Bila Anda uji script ini anda harus menempatkan nyata sandi (1234) pada “password” box.

• index.php

The mainly file for do 3 things.

* Login form. Including 2 fields “username” and “password” and submit button “Login”.
* Login authorize program. Do authorize check after you submit form, if passed in username and password, this page will re-direct to main.php. If not, show the invalid user or password message.
* Logout. Clear the login session when come back or refresh this page.

SOURCE CODE

<?
// Use session variable on this page. This function must put on the top of page.
session_start();

////// Logout Section. Delete all session variable.
session_destroy();

$message=””;

////// Login Section.
$Login=$_POST[‘Login’];
if($Login){ // If clicked on Login button.
$username=$_POST[‘username’];
$md5_password=md5($_POST[‘password’]); // Encrypt password with md5() function.

// Connect database.
$host=”localhost”; // Host name.
$db_user=””; // MySQL username.
$db_password=””; // MySQL password.
$database=”tutorial”; // Database name.
mysql_connect($host,$db_user,$db_password);
mysql_select_db($database);

// Check matching of username and password.
$result=mysql_query(“select * from admin where username=’$username’ and password=’$md5_password'”);
if(mysql_num_rows($result)!=’0′){ // If match.
session_register(“username”); // Craete session username.
header(“location:main.php”); // Re-direct to main.php
exit;
}else{ // If not match.
$message=”— Incorrect Username or Password —“;
}

} // End Login authorize check.
?>

<html xmlns=”http://www.w3.org/1999/xhtml”&gt;
<head>
<meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″ />
<title>Untitled Document</title>
</head>

<body>
<? echo $message; ?>
<form id=”form1″ name=”form1″ method=”post” action=”<? echo $PHP_SELF; ?>“>
<table>
<tr>
<td>User : </td>
<td><input name=”username” type=”text” id=”username” /></td>
</tr>
<tr>
<td>Password : </td>
<td><input name=”password” type=”password” id=”password” /></td>
</tr>
</table>
<input name=”Login” type=”submit” id=”Login” value=”Login” />
</form>
</body>
</html>

• main.php

This file is the target file when authorize check on index.php has been passed. It checks for session variable name “username”. If this variable does not exist, re-direct to index.php.

If you have PHP files must Login before open them, copy the PHP section and place it on the top of them.

SOURCE CODE
<?
// You may copy this PHP section to the top of file which needs to access after login.
session_start();
// Use session variable on this page. This function must put on the top of page.
if(!session_is_registered(“username”)){
// if session variable “username” does not exist.
header(“location:index.php”);
// Re-direct to index.php
}
?>

<html xmlns=”http://www.w3.org/1999/xhtml”&gt;
<head>
<meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″ />
<title>Untitled Document</title>
</head>

<body>
<p>Hello <? echo $_SESSION[‘username’]; ?>! You are now Logged in.</p>
<p><a href=”index.php”>Logout</a></p>
</body>
</html>

~ oleh desktopku pada Februari 18, 2009.

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