Output last edited page details from Wordpress

<?php

//This outputs a tab-delimited list of the 50 last modified pages, suitable for importing into a spreadsheet.
//By Chad Haefele (chad.haefele@gmail.com), December 2013
//Inspired by the top answer here: http://stackoverflow.com/questions/3464701/export-list-of-pretty-permalinks-and-post-title
//Query built with http://wpquerygenerator.com/

include "wp-load.php";

    //Add column headers:
    echo "\nPage Title\tURL\tLast Modified Date\tLast Author";

    //Build the query and get the results:
        $custom_query = new WP_Query(array(
            'post_type' => 'page',
            'orderby' => 'modified',
            'posts_per_page' => 50,
            'paged' => (get_query_var('paged')) ? get_query_var('paged') : 1
    ));

    //Loop through the results and display them, tab-delimited:
    if ( $custom_query->have_posts() ) {
        while ( $custom_query->have_posts() ) {
            $custom_query->the_post();
            //Extract necessary fields:
            $mod_date = get_the_modified_date();
            $title = get_the_title();
            $url = get_page_link();
            $mod_author = get_the_modified_author();

            echo "\n{$title}\t{$url}\t{$mod_date}\t{$mod_author}";
        }
    } else {
    echo "Error: No pages met your query's criteria.";
    }
?>