Creating Cookie – Last Visit Script

<?php
//Calculate 60 days in the future
//seconds * minutes * hours * days + current time
$inTwoMonths = 60 * 60 * 24 * 60 + time();
setcookie('lastVisit', date("G:i - m/d/y"), $inTwoMonths);
?>

Retrieving Cookie

If your cookie hasn’t expired yet, you can retrieve it from the user’s PC using the named $_COOKIE associative array. The name of your stored cookie is the key and will let you retrieve your stored cookie value!

<?php
if(isset($_COOKIE['lastVisit']))
	$visit = $_COOKIE['lastVisit'];
else
	echo "You've got some stale cookies!";
 
echo "Your last visit was - ". $visit;
?>

Creating And Retrieving Cookies In PHP is a post from: PHP Magic Book - Free PHP Scripts, Tutorials and Downloads

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Example

<?php
session_start();
if(isset($_SESSION['views']))
    $_SESSION['views'] = $_SESSION['views']+ 1;
else
    $_SESSION['views'] = 1;
 
echo "views = ". $_SESSION['views'];
?>

The above script is checking that ‘views’ or $views variable is set in session or not.

isset Function in PHP – Check for any Variable if it is Set or Not in PHP is a post from: PHP Magic Book - Free PHP Scripts, Tutorials and Downloads

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Sometimes we store id, name and other information about user in PHP Sessions. A PHP session solves this problem by allowing you to store user information on the server for later use (i.e. username, shopping cart items, etc). However, this session information is temporary and is usually deleted very quickly after the user has left the website that uses sessions.

Sessions work by creating a unique identification (UID) number for each visitor and storing variables based on this ID. This helps to prevent two users’ data from getting confused with one another when visiting the same web page.

We can start, call or retrieve and use or destroy session or session data.

Starting a PHP Session

Before you can begin storing user information in your PHP session, you must first start the session. When you start a session, it must be at the very beginning of your code, before any HTML or text is sent.

Below is a simple script that you should place at the beginning of your PHP code to start up a PHP session.

<?php
session_start();
// start up your PHP session!
// this code must be at the top of web page.
?>

This code will register the user’s session with the server, allow you to start saving user information and assign a UID for that user’s session.

Storing A Session Variable

<?php
session_start();
$_SESSION['downloads'] = 1; // store session data
echo "Downloads = ". $_SESSION['donloads']; //retrieve data
?>

Using PHP issetFunction

<?php
session_start();
if(isset($_SESSION['views']))
    $_SESSION['views'] = $_SESSION['views']+ 1;
else
    $_SESSION['views'] = 1;
echo "views = ". $_SESSION['views'];
?>

Destroying Sessions

<?php
session_start();
session_destroy();
// By this all the session data will be erased and session will be reset, free and empty.
?>

OR

<?php
session_start();
session_destroy();
$_SESSION=array();
?>

Selectively Destroying Session Data

<?php
session_start();
unset($_SESSION['downloads']);
unset($_SESSION['userName']);
// session_destroy();
// $_SESSION=array();
// By this all the session data will not be lost. Just downloads and userName will be destroyed from session and if other data is ther, it will stay there.
?>

PHP – Sessions is a post from: PHP Magic Book - Free PHP Scripts, Tutorials and Downloads

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