wp_all_export_csv_rows.php

<?php
/**
 * ==================================
 * Filter: wp_all_export_csv_rows
 * ==================================
 *
 * Filters CSV rows to export.
 *
 * See 'wp_all_export_xml_rows' for XML data. (which get passed a single
 * record instead of an array of records)
 *
 * @param $articles
 * @param $options
 * @param $export_id
 *
 * @return array - the records to import
 */
function wp_all_export_csv_rows($articles, $options, $export_id)
{
    // Unless you want this code to execute for every export, be sure to check the export id
    //
    // if ($export_id === 5) { ...

    // $articles contains on array of records for importing.
    // Loop through the array and unset() any entries you don't
    // want imported

    return $articles; // Return the array of records to import
}

add_filter('wp_all_export_csv_rows', 'wp_all_export_csv_rows', 10, 2);


// ----------------------------
// Example uses below
// ----------------------------

/**
 * Import based on some criteria. In this case pricing.
 *
 */
function my_export_csv_rows($articles, $options, $export_id)
{
    foreach ($articles as $key => $article) {
        if (!empty($article['Regular Price'] && !empty($article['Sale Price']))) {
            if ($article['Sale Price'] < ($article['Regular Price'] / 2)) {
                unset($articles[$key]);
            }
        }
    }

    return $articles;
}

add_filter('wp_all_export_csv_rows', 'my_export_csv_rows', 10, 2);