Session in PHP

⟼ PHP session is used to store and pass information in variables to be used across multiple pages.:

⟼ In PHP session creates unique user id for each browser to recognize the user and avoid conflict between multiple browsers.

You can see example of shopping website where store username, product code, product name, product price etc.

How Session Works

Start Session in PHP

In PHP in-built a function named as session_start() this function starts a new or resumes existing session.It returns existing session if session is created already. If session is not available, it creates and returns new session..

Syntax

PHP $_SESSION

$_SESSION is used to set and get session variable values.

Example:-

File name :- session1.php

   <?php  
  session_start();  
  ?>  
<html>  
<body>  
  <?php  
  $_SESSION["user"] = "Bill Gates";  
  echo "Session information are set successfully.<br/>";  
   ?>  
<a href="session2.php">Visit next page</a>  
</body>  
</html>  

File name :- session2.php

  <?php  
  session_start();  
  ?>  
<html>  
<body>  
  <?php  
 echo "User is: ".$_SESSION["user"];  
  ?>  
</body>  
</html>  

Output:-

Session Counter Example in PHP

File name :- SessionCounter.php

 <?php  
   session_start();  
  
   if (!isset($_SESSION['counter'])) {  
      $_SESSION['counter'] = 1;  
   } else {  
      $_SESSION['counter']++;  
   }  
   echo ("Page Views: ".$_SESSION['counter']);  
  ?>  
 

Output:-

PHP Session Destroy

session_destroy() funtion is used to destroy all session.

Example:- sessiondis.php

 <?php  
   session_start();  
  
   if (!isset($_SESSION['counter'])) {  
      $_SESSION['counter'] = 1;  
   } else {  
      $_SESSION['counter']++;  
   }  
   echo ("Page Views: ".$_SESSION['counter']);  
   session_destroy();  
  ?>  

Output:-

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Session in PHP

How Session Works

Start Session in PHP

PHP $_SESSION

Example:-

Session Counter Example in PHP

PHP Session Destroy