How can debugging techniques be applied to identify and resolve issues with session variables in PHP code?

Session variables in PHP can sometimes cause issues such as not being set or not persisting between pages. To identify and resolve these issues, you can use debugging techniques like printing out the session variables, checking if the session has started, and ensuring proper session configuration. 

<?php
session_start();

// Debugging session variables
echo "<pre>";
print_r($_SESSION);
echo "</pre>";

// Check if session has started
if(session_status() == PHP_SESSION_NONE){
    session_start();
}

// Ensure proper session configuration
ini_set('session.cookie_lifetime', 86400); // 1 day
ini_set('session.gc_maxlifetime', 86400); // 1 day

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