[WordPress] On Writing Readable WordPress Functions

00-get-details.js

$.get(ajaxurl, {
    'action': 'getDetails',
    'security': $('input[name="acme-security-nonce"]').val()
}, function(response) {
    if (false === response.success) {
        // Handle the case when the request wasn't successful.
    }

    // Work with the information that was returned in the response.data property.
});

01-get-details.php

<?php
/**
 * @return bool true if we're able to make Ajax requests; otherwise, false
 */
private function verifyRequest()
{
    return
        isset($_GET['security']) &&
        wp_verify_nonce(strip_tags(stripslashes($_GET['security'])), 'getDetails');
}

02-do-details-exists.php

<?php

/**
 * @return bool true if there are details; false, otherwise
 *
 * @access private
 */
private function doDetailsExist()
{
    return (new WP_Query([
        'post_type' => 'acme_post_type',
        'post_status' => 'publish',
    ]))->have_posts();
}

03-get-detail-ids.php

<?php
/**
 * @return array a numerically indexed array of all detail IDs
*/
private function getDetailIds(): array
{
    global $wpdb;
    $results = $wpdb->get_results(
        $wpdb->prepare("
        SELECT meta_value
        FROM $wpdb->postmeta
        WHERE meta_key = %s
        ORDER BY meta_value ASC
        ", 'acme_detail_number'),
        ARRAY_N
    );

    $detailIds = [];
    array_push($detailIds, array_map(function ($result) {
        return $result[0];
    }, $results));

    return $detailIds[0] ?? $detailIds;
}