What is the common issue with session variables not being carried over to different directories in PHP?

The common issue with session variables not being carried over to different directories in PHP is due to the session cookie path not being set correctly. To solve this issue, you need to set the session cookie path to the root directory "/" in your PHP script. 

// Set session cookie path to the root directory
session_set_cookie_params(0, '/');
session_start();

// Now you can set and access session variables across different directories
$_SESSION['example'] = 'Hello World';

Keywords

session variables directories PHP session_start() session_save_path

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