How can errors related to session handling be effectively debugged in PHP?

Session handling errors in PHP can be effectively debugged by checking if the session has been started before trying to manipulate session variables. Additionally, ensuring that the session is properly initialized with session_start() at the beginning of each page where session variables are used can help prevent errors. 

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

// Check if session is set
if(isset($_SESSION['username'])) {
    // Access session variables
    echo 'Welcome back, ' . $_SESSION['username'];
} else {
    // Set session variable
    $_SESSION['username'] = 'JohnDoe';
    echo 'Session variable set';
}
?>

Keywords

session handling debugging PHP error messages troubleshooting

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