What are some common methods for passing variables between PHP files for different functionalities?

When passing variables between PHP files for different functionalities, common methods include using sessions, cookies, GET and POST methods, and including files. Sessions can store variables that can be accessed across multiple pages, cookies can store variables on the client side, GET and POST methods can pass variables through URLs or forms, and including files can share variables between files. 

// Using sessions to pass variables between PHP files
// File 1: set_variable.php
session_start();
$_SESSION['variable'] = 'value';

// File 2: get_variable.php
session_start();
echo $_SESSION['variable'];

Keywords

include require $_GET $_POST session variables

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