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PHP Core Concepts

bookWorking 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

session_cookie_example.php

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<?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 $_REQUEST to access incoming data from GET, POST, or COOKIE, but be cautious about the source;
  • Use $_SESSION to store data securely on the server for a single user during their session;
  • Use $_COOKIE to store small pieces of data on the client for longer-term persistence across sessions.
question mark

Which PHP superglobal is used to store data across multiple pages for a single user session?

Select the correct answer

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Sektion 3. Kapitel 3

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Suggested prompts:

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?

bookWorking with $_REQUEST, $_SESSION, and $_COOKIE

Stryg for at vise menuen

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

session_cookie_example.php

copy

              
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 $_REQUEST to access incoming data from GET, POST, or COOKIE, but be cautious about the source;
  • Use $_SESSION to store data securely on the server for a single user during their session;
  • Use $_COOKIE to store small pieces of data on the client for longer-term persistence across sessions.
question mark

Which PHP superglobal is used to store data across multiple pages for a single user session?

Select the correct answer

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 3. Kapitel 3
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