Cookies Sessions

7/28/2019 Cookies Sessions

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F5224

WEB PROGRAMMING

Prepared by: Munirah Abd

COOKIES

&

SESSION


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COOKIES


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WHAT IS COOKIES?

A cookie is often used to identify a user

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.


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HOW TO CREATE A COOKIE?

The setcookie() function is used to set a cookie.

setcookie(name, value, expire, path, domain);

SYNTAX

Note: The setcookie() function must appear BEFORE the tag.


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We will create a cookie named "user" and assign

the value "Alex Porter" to it. We also specifythat the cookie should expire after one hour:

EXAMPLE 1

.....

SYNTAX

Note: The value of the cookie is automatically URLencoded when sending the cookie,

and automatically decoded when received (to prevent URLencoding, use setrawcookie() instead).


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Set the expiration time of the cookie in another way. It

may be easier than using seconds.

EXAMPLE 2

.....

SYNTAX

Note: The expiration time is set to a month (60 sec * 60 min * 24 hours * 30 days).


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HOW TO RETRIEVE A COOKIE VALUE?

The PHP $_COOKIE variable is used to retrieve a

cookie value.

SYNTAX


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HOW TO RETRIEVE A COOKIE VALUE?

Use the isset() function to find out if a cookie has

been set

EXAMPLE 2

SYNTAX


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HOW TO DELETE COOKIES

When deleting a cookie you should assure

that the expiration date is in the past.

SYNTAX


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..QUESTION..

What if a BrowserDoes NOT Support

Cookies?


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SESSIONS


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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.


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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

Note: The session_start() function must appear BEFORE the tag


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STORING SESSION VARIABLE

EXAMPLE


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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

SYNTAX


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DESTROYING A SESSIONS

Completely destroy the session by calling the session_destroy()

function

SYNTAX

Note: session_destroy() will reset your session and you will lose all your stored session data.


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THE END

Cookies Sessions

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