How can global variables be effectively used in PHP for multi-user functionality in an ERP system?

Global variables can be used in PHP for multi-user functionality in an ERP system by storing user-specific data such as user ID, username, or permissions. This allows different users to access their own data without interference from other users. However, it is important to properly sanitize and validate user input to prevent security vulnerabilities. 

// Set global variable for user ID
global $user_id;
$user_id = $_SESSION['user_id'];

// Set global variable for username
global $username;
$username = $_SESSION['username'];

// Set global variable for user permissions
global $permissions;
$permissions = $_SESSION['permissions'];

Keywords

global variables multi-user functionality ERP system PHP error types

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