FP512 Cookies sessions
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This document discusses cookies and sessions in web programming. It defines cookies as data stored on the user's computer that can track details about their visits. Cookies are commonly used to store login information so users don't have to re-enter credentials. The document explains how to create, retrieve, and delete cookies using PHP functions like setcookie(). Sessions are introduced as an alternative to cookies for storing user information on the server. The document outlines how to start a session, store session variables, and destroy a session in PHP.
![HOW TO CREATE A COOKIE?
Example
setcookie(name, value, expire);
setcookies(“user”,”fiza”,time()+300);
If(isset(&_COOKIE[“user”]))
echo “Hai” . &_COOKIE[“user”] . “<br>”
else
echo “Welcome guest!!<br>”;
NOTE : If you do not set this expiration date, the
cookie will removed when the browser is restarted. Prepared by: PN. ZATI HANANI ZAINAL](https://image.slidesharecdn.com/cookiessessions-141015202125-conversion-gate01/85/FP512-Cookies-sessions-7-320.jpg)
![HOW TO RETRIEVE A COOKIE VALUE?
The PHP $_COOKIE variable is used to retrieve a
cookie value.
<?php
// Print a cookie
echo $_COOKIE["user"];
// A way to view all cookies
print_r($_COOKIE);
?>
SYNTAX
Prepared by: PN. ZATI HANANI ZAINAL](https://image.slidesharecdn.com/cookiessessions-141015202125-conversion-gate01/85/FP512-Cookies-sessions-10-320.jpg)
![HOW TO RETRIEVE A COOKIE VALUE?
EXAMPLE 2
Use the isset() function to find out if a cookie has
been set
<html>
<body>
<?php
if (isset($_COOKIE["user"]))
echo "Welcome " . $_COOKIE["user"] . "!<br />";
else
echo "Welcome guest!<br />";
?>
</body>
</html>
SYNTAX
Prepared by: PN. ZATI HANANI ZAINAL](https://image.slidesharecdn.com/cookiessessions-141015202125-conversion-gate01/85/FP512-Cookies-sessions-11-320.jpg)
![STORING SESSION VARIABLE
<?php
EXAMPLE
session_start();
$_SESSION['views']=1; // store session data
?>
<html>
<body>
<?php
//retrieve session data
echo "Pageviews=". $_SESSION['views'];
?>
</body>
</html>
Prepared by: PN. ZATI HANANI ZAINAL](https://image.slidesharecdn.com/cookiessessions-141015202125-conversion-gate01/85/FP512-Cookies-sessions-16-320.jpg)
![DESTROYING A SESSIONS
To delete some session data, you can use the unset() or the
session_destroy() function.
The unset() function is used to free the specified session variable
<?php
unset($_SESSION['views']);
?>
SYNTAX
Prepared by: PN. ZATI HANANI ZAINAL](https://image.slidesharecdn.com/cookiessessions-141015202125-conversion-gate01/85/FP512-Cookies-sessions-17-320.jpg)
FP512 Cookies sessions
- 1. FP512 WEB PROGRAMMING I COOKIES & SESSION Prepared by: PN. ZATI HANANI ZAINAL
- 2. UNDERSTAND COOKIES & SESSIONS Define Cookies Create Cookies Retrieve the value of a cookies Delete cookies Define sessions Create session Delete session Prepared by: PN. ZATI HANANI ZAINAL
- 3. COOKIES Prepared by: PN. ZATI HANANI ZAINAL
- 4. WHAT IS COOKIES? A cookie is often used to identify a user. Embed on user PC (client). To track certain user details like (No. Of Visits, names, last visit, etc). The client machine stores such information and sends it to the web server whenever there is a request. Cookies data are sent along with the HTTP headers. Prepared by: PN. ZATI HANANI ZAINAL
- 5. COOKIES ARE POPULAR?? Most popular uses of cookies? To store username/password information so user doesn't have to log in every time ("remember me"). To simply remember the user's name. To keep track of a users progress during a specified process. To remember a users theme. Prepared by: PN. ZATI HANANI ZAINAL
- 6. HOW TO CREATE A COOKIE? The setcookie() function is used to set a cookie. SYNTAX setcookie(name, value, expire, path, domain); name: The name of your cookie. value: The value that is stored in your cookie. expiration: The date when the cookie will expire and be deleted. Note: The setcookie() function must appear BEFORE the <html> tag. Prepared by: PN. ZATI HANANI ZAINAL
- 7. HOW TO CREATE A COOKIE? Example setcookie(name, value, expire); setcookies(“user”,”fiza”,time()+300); If(isset(&_COOKIE[“user”])) echo “Hai” . &_COOKIE[“user”] . “<br>” else echo “Welcome guest!!<br>”; NOTE : If you do not set this expiration date, the cookie will removed when the browser is restarted. Prepared by: PN. ZATI HANANI ZAINAL
- 8. HOW TO CREATE A COOKIE? EXAMPLE 1 We will create a cookie named "user" and assign the value "Alex Porter" to it. We also specify that the cookie should expire after one hour: <?php setcookie("user", "Alex Porter", time()+3600); ?> <html> ..... SYNTAX Note: The value of the cookie is automatically URLencoded when sending the cookie, Prepared by: PN. ZATI HANANI ZAINAL and automatically decoded when received (to prevent URLencoding, use setrawcookie() instead).
- 9. HOW TO CREATE A COOKIE? EXAMPLE 2 Set the expiration time of the cookie in another way. It may be easier than using seconds. <?php $expire=time()+60*60*24*30; setcookie("user", "Alex Porter", $expire); ?> <html> ..... SYNTAX Note: The expiration time is set to a month (Prepared by: PN. ZATI HANANI ZAINAL 60 sec * 60 min * 24 hours * 30 days).
- 10. HOW TO RETRIEVE A COOKIE VALUE? The PHP $_COOKIE variable is used to retrieve a cookie value. <?php // Print a cookie echo $_COOKIE["user"]; // A way to view all cookies print_r($_COOKIE); ?> SYNTAX Prepared by: PN. ZATI HANANI ZAINAL
- 11. HOW TO RETRIEVE A COOKIE VALUE? EXAMPLE 2 Use the isset() function to find out if a cookie has been set <html> <body> <?php if (isset($_COOKIE["user"])) echo "Welcome " . $_COOKIE["user"] . "!<br />"; else echo "Welcome guest!<br />"; ?> </body> </html> SYNTAX Prepared by: PN. ZATI HANANI ZAINAL
- 12. HOW TO DELETE COOKIES When deleting a cookie you should assure that the expiration date is in the past. <?php // set the expiration date to one hour ago setcookie("user", "", time()-3600); ?> SYNTAX Prepared by: PN. ZATI HANANI ZAINAL
- 13. SESSIONS Prepared by: PN. ZATI HANANI ZAINAL
- 14. WHAT IS SESSIONS? A PHP session variable is used to store information about, or change settings for a user session. Session variables hold information about one single user, and are available to all pages in one application. PHP session solves this problem by allowing you to store user information on the server for later use. Use of session: 1) Login function 2) Shopping cart Prepared by: PN. ZATI HANANI ZAINAL
- 15. STARTING A PHP SESSION Before you can store user information in your PHP session, you must first start up the session. The code below 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. SYNTAX <?php session_start(); ?> <html> <body></body> </html> Prepared by: PN. ZATI HANANI ZAINAL Note: The session_start() function must appear BEFORE the <html> tag
- 16. STORING SESSION VARIABLE <?php EXAMPLE session_start(); $_SESSION['views']=1; // store session data ?> <html> <body> <?php //retrieve session data echo "Pageviews=". $_SESSION['views']; ?> </body> </html> Prepared by: PN. ZATI HANANI ZAINAL
- 17. DESTROYING A SESSIONS To delete some session data, you can use the unset() or the session_destroy() function. The unset() function is used to free the specified session variable <?php unset($_SESSION['views']); ?> SYNTAX Prepared by: PN. ZATI HANANI ZAINAL
- 18. DESTROYING A SESSIONS Completely destroy the session by calling the session_destroy() function <?php session_destroy(); ?> SYNTAX Prepared by: PN. ZATI HANANI ZAINAL Note: session_destroy() will reset your session and you will lose all your stored session data.
- 19. THE END Prepared by: PN. ZATI HANANI ZAINAL