Php - Getting good with session
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Session in PHP allows for maintaining and accessing user data across multiple pages of a website. It stores data on the server side and associates it with a unique ID saved in a cookie on the client side. The $_SESSION superglobal array is used to store and retrieve session variables. Session_start() must be called before accessing session variables, and session_destroy() ends the current session and destroys all associated data. Sample code demonstrates registering a session on login and checking for a valid session on subsequent pages.
![PHP Session [email_address]](https://image.slidesharecdn.com/phpsession-111226141325-phpapp02/85/Php-Getting-good-with-session-1-320.jpg)
![What is Session in PHP? $_SESSION[‘variable’] A special type of variable whose value is maintained across subsequent pages Its value will be destroyed if The user closes the web browser, or the maximum time allotment set on the server for session lifetime is exceeded, or session_destroy()](https://image.slidesharecdn.com/phpsession-111226141325-phpapp02/85/Php-Getting-good-with-session-3-320.jpg)
![Important Special Variables $_SESSION[] - PHP super global array variable that contains currently registered to a script's session. session_start() - initialises session data. This function is called prior to creating a new session variable using $_SESSION[]. session_destroy() - destroys all data registered to a script's current session. session_id() - used to get the id value for the current session.](https://image.slidesharecdn.com/phpsession-111226141325-phpapp02/85/Php-Getting-good-with-session-5-320.jpg)
![Applying Session: register a session <?php if (isset($_POST['submit'])) { if ($_POST['username'] == 'admin' && $_POST['password'] == 'admin') { session_start(); $_SESSION['username'] = $_POST['username']; header('Location:index.php'); } else echo "You have entered wrong username and password"; } else { echo "Please enter valid username and password"; } ?>](https://image.slidesharecdn.com/phpsession-111226141325-phpapp02/85/Php-Getting-good-with-session-7-320.jpg)
![Applying Session: start session in subsequent pages <?php session_start(); if ( !isset($_SESSION['username'] )) { header('Location:login.php'); } else { echo "<div align=\"right\">"; echo "login as: " . $_SESSION['username']; echo " | <a href=\"logout.php\">logout</a>"; echo "</div>"; } ?>](https://image.slidesharecdn.com/phpsession-111226141325-phpapp02/85/Php-Getting-good-with-session-8-320.jpg)
Php - Getting good with session
- 2. Agenda What is session in PHP? Why use session? What are important special variables? How to apply session in your web application? Sample application.
- 3. What is Session in PHP? $_SESSION[‘variable’] A special type of variable whose value is maintained across subsequent pages Its value will be destroyed if The user closes the web browser, or the maximum time allotment set on the server for session lifetime is exceeded, or session_destroy()
- 4. Why Session? the HTTP protocol used to browse the web is stateless Each request for a page is completely independent of earlier requests so if you want subsequent pages to "remember" the user’s name that he/she entered on your front page, you have to store that information somewhere.
- 5. Important Special Variables $_SESSION[] - PHP super global array variable that contains currently registered to a script's session. session_start() - initialises session data. This function is called prior to creating a new session variable using $_SESSION[]. session_destroy() - destroys all data registered to a script's current session. session_id() - used to get the id value for the current session.
- 6. Redirecting to Another Page header("Location: http://www.domain.com") - header function used redirect the browser page to the Location parameter provided.
- 7. Applying Session: register a session <?php if (isset($_POST['submit'])) { if ($_POST['username'] == 'admin' && $_POST['password'] == 'admin') { session_start(); $_SESSION['username'] = $_POST['username']; header('Location:index.php'); } else echo "You have entered wrong username and password"; } else { echo "Please enter valid username and password"; } ?>
- 8. Applying Session: start session in subsequent pages <?php session_start(); if ( !isset($_SESSION['username'] )) { header('Location:login.php'); } else { echo "<div align=\"right\">"; echo "login as: " . $_SESSION['username']; echo " | <a href=\"logout.php\">logout</a>"; echo "</div>"; } ?>
- 9. Applying Session: Kill a Session <?php session_start(); session_destroy(); header('location:index.php'); ?>