In web application, it is frequently desirable to
Remember if user has visited a site previously
Remember the sequence of pages visited during a session
Associate information with a user session
To accomplish these thing need have â€œStatefulâ€ connections between client and server
That is, associated information (state) with the connection
HTTP was originally designed to not be stateful, leading to the addition of the cookies machine
The solution: store session information on the server,
and have the client only store an identifier for its
information as stored on the server.
The identifier is known as a session ID. The session ID
is stored using a cookie (can be passed as a GET
parameter as well)
The server then uses the session ID to retrieve the
information it has stored on the server.
Session information is typically stored in files on the
server, though options exist for using shared memory,
and also writing your own handlers (e.g., to use a
database for storage)
Cookies are used to remember the users. Content of a Persistent cookie remains
unchanged even when the browser is closed. â€˜Remember meâ€™ generally used for login
is the best example for Persistent Cookie
- A mechanism for adding state to HTTP request
- Permits name, value pairs to be preserved across multiple approach
- Basic approach
- Servers sends a set â€“cookies HTTP header in its response
- Value of header includes name, value pairs
- The client stores the name, value pairs and proactively sends them to the server (in the cookies header) with every request thereafter
- The cookies protocol piggybacks on top of HTTP
How to set cookies in PHP?
Cookies are often used to track user information.
Cookies can be set in PHP using the setcookie() function.
Parameters are : name of the cookie, Value of cookie, time for expiry of cookie, path
of the cookies location on server, domain, secure (TRUE or FALSE) indication
whether the cookie is passed over a secure HTTPS, http only (TRUE) which will make
the cookie accessible only through HTTP.
Returns TRUE or FALSE depending on whether the cookie was executed or not.