How Can I Store and Retrieve Session Variables Across Multiple PHP Pages?

Store and Use Session Variables Across Pages

To begin, it's crucial to start a session and store a session variable at the very start of a page's execution, without any prior output. This is essential for the session to function correctly.

Setting Session Variables

In the first page, execute the following code:

<?php
session_start();
$_SESSION['myvar'] = 'myvalue';
?>

This code starts a session and assigns the value 'myvalue' to the session variable 'myvar'.

Checking Session Variables

On a subsequent page, use the following code to check if the session variable is set and has the expected value:

<?php
session_start();
echo "1";

if (isset($_SESSION['myvar'])) {
    echo "2";

    if ($_SESSION['myvar'] == 'myvalue') {
        echo "3";
        exit;
    }
}
?>

If the session variable is set and has the value 'myvalue', the code will output the following sequence:

1
2
3

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