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Session in PHP



It is used to provide server-side state management option using Session object we can store page content( data) after response means session provides a persistent object which can retain data in browser cookie or database then  we can use it into different web pages.
The session is mandatory to create login form in a web application because the session will provide dynamic data for multiple users to contain information.
for example if five different users login to the system then the session object provides a separate identity to all five users.
session always will be created after login and destroy after logout. without session we can not handle login and logout operation.
Syntax to create Session in PHP:-
session_start();   //only one time in page
$_SESSION['key']=value;

Syntax to destroy the session

session_unset('key');   //destory particular session
session_destory();      //destory all session
Session is used to provide security, if we want to restrict users to access internal page without login then using session object we can proceed to user's in login page.we should always check session data that it is set or not.
<?php
    if(isset($_SESSION['key'])){
    header("location:loginphp");
    }
 ?> 
Code for Session:-
adminlogin.php:-
<?php
session_start();
$user = $_REQUEST['txtuser'];
$pass = $_REQUEST['txtpass'];
$ram =mysqli_connect('localhost','root','','php12batch');
$res = mysqli_query($ram,"select * from admin where userid='$user' and password='$pass'") ;
if(mysqli_num_rows($res)>0)
{
    $_SESSION['uid']=$user;
    header('location:index1.php');
}
else
{
    echo "incorrect userid and password";
}
?>
index1.php

<?php
session_start();
if($_SESSION['uid']==null)
{ 
    header('location:index.php');
}

?>
<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
<body>
    <a href="logout.php">Logout</a>
<form action="InsertStu.php" method="post">
<input type="text" name="txtrno" placeholder="Enter rno" />
<br>
<br>
<input type="text" name="txtsname" placeholder="Enter name" />
<br>
<br>
<input type="text" name="txtbranch" placeholder="Enter branch" />
<br>
<br>
<input type="text" name="txtfees" placeholder="Enter fees" />
<br>
<br>
<input type="submit" name="btnsubmit" value="Insert">
</form>   

<a href="ViewStudent.php">View Student</a>
<br>
<a href="TableViewStudent.php">View Student in Table Format</a>
<br>
<a href="TableViewEditDeleteStudent.php">Edit|Delete Student in Table Format</a>
</body>
</html>
..........................................

<?php
session_start();
session_destroy();

header('location:index.php');

?>
Complete code of session, login, view, edit and delete here
https://github.com/shivaconceptsolution/PHP11/tree/master/php11/db

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