PHP Basics - session control - cookies

1. What is? cookie ?

Cookie It is a mechanism to store data in the remote browser side to track and identify users .

2. establish cookie

<?php
	# setcookie(name, value, expire, path, domain);
	setcookie('user_name', 'Chon', 7200);

name yes cookie Name identification . It's necessary

value yes cookie Initial value . It's necessary

expire Used for setting up cookie The validity of the . Optional

path Used for setting up cookie The relevant path of . Optional

domain Used to set the effect on cookie The website of . Optional

3. obtain cookie

<?php
    #  Use  $_COOKIE  Global variables get 
    if (isset($_COOKIE['user_name'])) {
    
    	$user_name = $_COOKIE['user_name']; #  Get the name defined above as  user_name  Of  cookie 
    }

4. Delete cookie

<?php
    setcookie('user_name', ''); #  Set to null 
	setcookie('user_name', '', time()-3600); #  Set to past time