There are many ways to retain this information, most common are
- Session Management via Cookies
- Embedding Session information in URLs
- Storing Information on server in $_SESSION array (in PHP)
To start a session our page has its first line to session_start(); this tell the server to initialize $_SESSION array if it is already started it will make it available it to page. We can add any number or variable to this array, in our example we will make an simple HTML page and display user a greeting if he is log-in else we will show him a log-in form.
now Let the Code Talk
<?php
session_start();
error_reporting(0);
// CHECK if form is submitted
if(isset ($_POST["submit"])){
$username=$_POST["username"];
$password=$_POST["password"];
if($username=="originative" && $password=="tutorialjinni"){
$_SESSION["isLoggedIn"]=1;
//setting a varable so that later i know
// that this user i logged in
$_SESSION["uname"]=$username;
//setting another variable
}
}
// for logout or destroy session
if(isset($_GET["action"])){
if($_GET["action"]){
session_unset();
//unset all session variables
session_destroy();
// destroy session
}
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>PHP Session Login Example | Tutorial Jinni | Originative Systems</title>
</head>
<body>
<?php
if(!$_SESSION["isLoggedIn"]==1){
// checking the value of isLoggedIn
?>
<form action="" method="post">
<table width="400" border="0" cellpadding="8" cellspacing="0">
<tr>
<td align="right">User Name : </td>
<td><label for="username"></label>
<input name="username" type="text" id="username" size="35" /></td>
</tr>
<tr>
<td align="right">Password : </td>
<td><label for="pass"></label>
<input name="password" type="password" id="pass" size="35" /></td>
</tr>
<tr>
<td colspan="2"><input type="submit" name="submit" id="submit" value="Let me In" /></td>
</tr>
</table>
</form>
<?php
}
else{
echo "Welcome <b><em>".$_SESSION["uname"]."</em></b>
To Logout Click <a href='sess.php?action=logout'>Here</a>";
}
?>
</body>
</html>
8 comments:
very good tutorial , informative, keep it up
Hi, I found one misspelled row (10.):
if($username=="originative" && $password="tutorialjinni")...
Very good tutorial, thx
Thanks Viktor for pointing out, i fixed it
nice tutorial........ :)
im new for php. i use session but one warning always displayed 'Cannot send session cookie - headers already sent by'.
rply me.......
such type of warning comes when you echo anything before initializing session, it may be a white space in an html document.
can u add the contents in sess.php also?
you can add any type of content in session like files, object etc... but it is recommend that you put minimal data in it.
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