In the context of PHP programming, what are some common reasons for the failure of automatic login functionality despite cookies and correct data being present?

One common reason for the failure of automatic login functionality despite cookies and correct data being present is that the session may not be properly started or resumed before checking for the login status. To solve this issue, make sure to start or resume the session at the beginning of the script before checking if the user is logged in. 

<?php
session_start(); // Start or resume the session

if(isset($_SESSION['logged_in']) && $_SESSION['logged_in'] === true) {
    // User is logged in, perform necessary actions
} else {
    // User is not logged in, redirect to login page
    header("Location: login.php");
    exit();
}
?>

Keywords

cookie session authentication authorization redirect

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