Add page numbers to page titles in Member Directory Add On for Paid Memberships Pro

pmpro-member-directory-page-number-in-title

<?php
/*
*/
function my_pmpro_add_directory_page_numbers($title){
    global $post, $pmpro_pages;
    $pn = 0;
    if( isset($_REQUEST['pn'] ) )
    {
        $pn = sanitize_text_field( $_REQUEST['pn'] );
    }
    if( ( $post->ID == $pmpro_pages['directory'] ) && $pn > 1 )
    {
        $title['page'] = "Page " . esc_html( $pn );
    }
    return $title;
}

function my_add_title_change(){
    add_filter("document_title_parts", "my_pmpro_change_directory_title", 999, 1);
}

add_action("wp", 'my_add_title_change', 999);