function page_init() { $mysqli = new mysqli('localhost', 'username', 'password', 'database'); }
function page_init() { session_start(); $_SESSION['username'] = 'john_doe'; }
function page_init() { require_once('vendor/autoload.php'); $client = new \GuzzleHttp\Client(); }In each of these examples, the page init function is used to set up the environment for the rest of the page. The mysqli library is used for database connections, session variables are set up to store user data, and a third-party library is loaded using Composer. Based on the examples provided, it is likely that the page init function is part of a larger package or framework that provides tools and utilities for building web applications using PHP. This could be a custom package developed in-house, or a popular library such as Laravel, Symfony, or CodeIgniter.