How can understanding PHP security features like globals improve code functionality and security?

Understanding PHP security features like globals can improve code functionality and security by preventing unauthorized access to sensitive data and reducing the risk of injection attacks. By properly managing global variables, developers can ensure that only authorized users can access and modify data, thereby enhancing the overall security of the application. 

// Example of using PHP security features to improve code functionality and security by avoiding global variables

function get_user_data() {
    $user_id = $_SESSION['user_id']; // Accessing user ID from session instead of using global variable
    // Fetch user data from database using $user_id
    return $user_data;
}

Keywords

PHP security globals code functionality security features error types

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