PHP Superglobals - Sessions

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PHP Start PHP Session

A session is a way to store information (in variables) to be used across multiple pages. By default, session variables last until the user closes the browser.

<?php
    /**
     * Start_PHP_Session.php
    */
    // Start the session
    session_start();
?>
<!DOCTYPE html>
<html lang="en">

<head>
    <title>phpTeeratus</title>
</head>
<body>
<?php

// Set session variables
$_SESSION["favcolor"] = "green";
$_SESSION["favanimal"] = "cat";

echo "Session variables are set.";
?>
</body>
</html>

Example 1

Result View Example

Echo session variables

<?php
session_start();
?>
<!DOCTYPE html>
<html>

<body>
    <h4>Echo_session_variables</h4>
    <?php
    // Echo session variables that were set on previous page
    echo "ex2 Echo_session_variables";
    echo "Favorite color is " . $_SESSION['favcolor'] . ".<br>";
    echo "Favorite animal is " . $_SESSION['favanimal'] . ".<br>";

    echo "ex2" . ".<br>";
    print_r($_SESSION);
    ?>
</body>
</html>

Example 2

Result View Example

Destroy a PHP Session

<?php
    // Start the session
    session_start();
?>
<!DOCTYPE html>
<html lang="en">
<body>
    
        <h2>phpTeeratus</h2>
        <p>From w3schools.com, Experiment by Teeratus_R </p>
    
        <h4>Destroy a PHP Session</h4>
        <p>
        To remove all global session variables and destroy the session, use session_unset() and session_destroy():   
        </p>
    

        <?php
        // remove all session variables
        session_unset();

        // destroy the session
        session_destroy();

        print_r($_SESSION);
        echo "<br>";
        echo "All session variables are now removed, and the session is destroyed.";
        ?>
       
</body>
</html>

Example 3

Result View Example

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