Session and cookies ,get and post methods
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This document discusses session, cookies, GET and POST methods in web development. It explains that HTTP is the communication protocol used to deliver web content. Sessions and cookies are used to store and retrieve user information across multiple requests. GET sends data via the URL query string, while POST encodes it in the message body. Sessions are more secure as cookies can be accessed directly, but both allow maintaining state on the server.
![Accessing cookie
<?php
// Print a cookie
echo $_COOKIE[“UserId"];
// A way to view all cookies
print_r($_COOKIE);
?>
• The PHP $_COOKIE variable is used to retrieve a cookie
value.](https://image.slidesharecdn.com/sessionandcookiesgetandpostmethods-150101014647-conversion-gate02/85/Session-and-cookies-get-and-post-methods-9-320.jpg)
![Session
• Session can be started in two ways in php.
• By calling the session.auto_start configuration setting in “php.in”.
• Calling session_start() on beginning of each pages whenever you
use session.
• Creating and accessing session.
• Once the session is started you can create and access session variables like any
other array variables.
$_SESSION[‘UserId']=1008;](https://image.slidesharecdn.com/sessionandcookiesgetandpostmethods-150101014647-conversion-gate02/85/Session-and-cookies-get-and-post-methods-12-320.jpg)
Session and cookies ,get and post methods
- 3. Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring Partner Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
- 4. HTTP HTTP is an TCP/IP based communication protocol, which is used to deliver data (HTML files, image files, query results etc) on the World Wide Web. It provides a standardized way for computers to communicate with each other. HTTP is stateless. The server and client are aware of each other only during a current request.
- 5. Cookies • Cookie are small text files that website can leave on visitors hard disk. • Common use of cookies are: • Remembering user name. • Maintaining shopping cart. • Keeping track of previously viewed content.
- 8. Creating Cookie setcookie(“UserId” , ”1008” , ”time()+3600”); Cookie variable Name Cookie variable value Expiration time
- 9. Accessing cookie <?php // Print a cookie echo $_COOKIE[“UserId"]; // A way to view all cookies print_r($_COOKIE); ?> • The PHP $_COOKIE variable is used to retrieve a cookie value.
- 10. Destroying cookie • There is no special method to destroy a cookie, we can achieve it by setting the cookie time into a past time so that it destroy it. setcookie(“UserId” , ”1008” , ”time()-100”);
- 11. Sessions • A PHP session variable is used to store information about, or change settings for a user session. • The session values by default expire when the browser is closed. • Technically , session are just a form of cookies with out an expiration date.
- 12. Session • Session can be started in two ways in php. • By calling the session.auto_start configuration setting in “php.in”. • Calling session_start() on beginning of each pages whenever you use session. • Creating and accessing session. • Once the session is started you can create and access session variables like any other array variables. $_SESSION[‘UserId']=1008;
- 13. GET and POST • There are two methods that we can send form data from client to server. • GET allows you to send data as part of the query string.That means data will be appended with the url. • POST method transfers information via HTTP message body The information is encoded and put into message body called QUERY_STRING.
- 14. GET • The PHP provides $_GET associative array to access all the sent information using GET method. • GET can't be used to send binary data, like images or word documents, to the server. http://www.test.com/index.htm?name1=value1&name2=value2
- 15. POST • The POST method can be used to send ASCII as well as binary data. • The PHP provides $_POST associative array to access all the sent information using POST method. <form method="post" action="registration.php">
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Editor's Notes
- #5: As mentioned above, HTTP is a connectionless and this is a direct result that HTTP is a stateless protocol. The server and client are aware of each other only during a current request. Afterwards, both of them forget about each other. Due to this nature of the protocol, neither the client nor the browser can retain information between different request across the web pages.
- #12: A PHP session variable is used to store information about, or change settings for a user session A PHP session store user information on the server for later use . session information is temporary and will be deleted after the user has left the website. Sessions work by creating a unique id (UID) for each visitor and store variables based on this UID. Session is available as long as the browser is opened .
- #15: The GET method is restricted to send upto 1024 characters only.