How can I create a PHP page if I have HTML knowledge and have downloaded phpBB?

To create a PHP page using your HTML knowledge and phpBB, you can start by creating a new PHP file in your phpBB directory. You can then include the phpBB common.php file at the beginning of your PHP page to access phpBB functions and variables. From there, you can mix your HTML knowledge with PHP code to create dynamic content for your page.

<?php
define('IN_PHPBB', true);
$phpbb_root_path = (defined('PHPBB_ROOT_PATH')) ? PHPBB_ROOT_PATH : './';
$phpEx = substr(strrchr(__FILE__, '.'), 1);
include($phpbb_root_path . 'common.' . $phpEx);

// Start session management
$user->session_begin();
$auth->acl($user->data);
$user->setup();

// Your HTML content mixed with PHP code here
echo '<h1>Welcome to my PHP page!</h1>';

// End session management
page_footer();