What is the recommended way to pass global variables between PHP files?

When passing global variables between PHP files, it is recommended to use sessions or cookies to maintain the values across different pages. Sessions store the data on the server side and provide a unique session ID to identify the user, while cookies store the data on the client side. Both methods allow for easy access to global variables throughout the application. 

// File 1: Setting a global variable in a session
session_start();
$_SESSION['globalVar'] = 'value';

// File 2: Accessing the global variable from the session
session_start();
echo $_SESSION['globalVar'];

Keywords

global variables PHP files include require $_SESSION

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