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session

This code is an example of using PHP sessions to store data on the server that can persist across multiple requests. A session is a way to store data on the server that is associated with a specific user.

The code starts the session using the session_start() function, this function creates a new session or resumes an existing one. Then it sets a session variable named "favcolor" to the value "green" using the $_SESSION superglobal array.

The code then includes an HTML document that includes a PHP script that prints the value of the "favcolor" session variable using the $_SESSION array. The script will display "Favorite color is green." on the page.

It is worth noting that sessions use a session ID that is stored in a cookie on the client's browser, and the data is stored on the server. This allows the server to associate the data with a specific user across multiple requests. Also, it is important to call the session_start() function before any output is sent to the browser, otherwise the session will not be created.

<?php
session_start();
// set session variables
$_SESSION["favcolor"] = "green";
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<?php
// print a session variable that was set before
echo "Favorite color is " . $_SESSION["favcolor"] . ".<br>";
?>
</body>
</html>

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