Session V/S Cookies

A cookie is an array of data stored by the browser on the client location and sent to the server with every request. It stores a limited amount of data about 4kb(i.e.: 4096 bytes). It is less secure than a session because it present on the client's computer.

The session is an array of data stored on the server and associated with a given user (usually via a cookie containing an id code). It stores an unlimited amount of data. It is more secure because of stored on the server.

Example of Cookie

<?php
 
  setcookie(name, value, expire, path, domain, secure, httponly);

  $cookie_uname = "user";

  $cookie_uvalue= "Retesh Kumar";

  //set cookies for 1 hour time
  setcookie($cookie_uname, $cookie_uvalue, 3600, "/");

  //expire cookies
  setcookie($cookie_uname,"",-3600);

?>

Example of Session

<?php
    
session_start();

//session variable
$_SESSION['user'] = 'Retesh';
 
//destroyed the entire sessions
session_destroy(); 
       
//Destroyed the session variable "user".
unset($_SESSION['user']);

?>