Working with $_REQUEST, $_SESSION, and $_COOKIE
PHP provides several built-in variables known as superglobals that allow you to access and manage data throughout your application. Among these, $_REQUEST, $_SESSION, and $_COOKIE are especially useful for handling user data across different pages and requests, but each serves a distinct purpose.
session_cookie_example.php
123456789101112131415161718192021222324<?php // Start the session session_start(); // Set a session variable $_SESSION['user'] = 'Alice'; // Set a cookie that expires in 1 hour setcookie('favorite_color', 'blue', time() + 3600); // Retrieve and display the session variable if (isset($_SESSION['user'])) { echo "Session user: " . $_SESSION['user'] . "<br>"; } else { echo "No session user found.<br>"; } // Retrieve and display the cookie value if (isset($_COOKIE['favorite_color'])) { echo "Favorite color from cookie: " . $_COOKIE['favorite_color'] . "<br>"; } else { echo "No favorite color cookie found.<br>"; } ?>
To summarize:
- Use
$_REQUESTto access incoming data from GET, POST, or COOKIE, but be cautious about the source; - Use
$_SESSIONto store data securely on the server for a single user during their session; - Use
$_COOKIEto store small pieces of data on the client for longer-term persistence across sessions.
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Can you give examples of how to use each of these superglobals in PHP?
What are the security considerations when using $_REQUEST, $_SESSION, and $_COOKIE?
When should I use $_SESSION instead of $_COOKIE?
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PHP provides several built-in variables known as superglobals that allow you to access and manage data throughout your application. Among these, $_REQUEST, $_SESSION, and $_COOKIE are especially useful for handling user data across different pages and requests, but each serves a distinct purpose.
session_cookie_example.php
123456789101112131415161718192021222324<?php // Start the session session_start(); // Set a session variable $_SESSION['user'] = 'Alice'; // Set a cookie that expires in 1 hour setcookie('favorite_color', 'blue', time() + 3600); // Retrieve and display the session variable if (isset($_SESSION['user'])) { echo "Session user: " . $_SESSION['user'] . "<br>"; } else { echo "No session user found.<br>"; } // Retrieve and display the cookie value if (isset($_COOKIE['favorite_color'])) { echo "Favorite color from cookie: " . $_COOKIE['favorite_color'] . "<br>"; } else { echo "No favorite color cookie found.<br>"; } ?>
To summarize:
- Use
$_REQUESTto access incoming data from GET, POST, or COOKIE, but be cautious about the source; - Use
$_SESSIONto store data securely on the server for a single user during their session; - Use
$_COOKIEto store small pieces of data on the client for longer-term persistence across sessions.
Grazie per i tuoi commenti!
