How can PHP developers effectively debug issues related to session variables not retaining their values?

Session variables not retaining their values can be debugged effectively by checking if the session_start() function is called before accessing or setting session variables, ensuring that session variables are properly initialized and stored, and verifying that the session cookie is being set correctly. 

<?php
session_start();

// Check if session variable is set
if(isset($_SESSION['username'])) {
    echo "Welcome back, " . $_SESSION['username'];
} else {
    echo "Session variable not set.";
}

// Set session variable
$_SESSION['username'] = 'JohnDoe';
?>

Keywords

PHP session variables debugging value retention troubleshooting

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