How can one effectively access and manipulate Wordpress page URLs within a custom PHP script, considering the limitations of direct server-side processing?

To effectively access and manipulate WordPress page URLs within a custom PHP script while considering the limitations of direct server-side processing, you can utilize WordPress functions like get_permalink() and add_query_arg() to retrieve and modify URLs dynamically. These functions ensure compatibility with WordPress permalinks settings and help in creating SEO-friendly URLs for your custom PHP script.

// Get the permalink of a specific page by ID
$page_id = 123;
$page_url = get_permalink($page_id);

// Add query parameters to the page URL
$modified_url = add_query_arg( array(
    'param1' => 'value1',
    'param2' => 'value2'
), $page_url );

// Output the modified URL
echo $modified_url;