mu-plugin for wordpress

mu-singh.php

<?php

/**
 * Plugin Name: MU Singh
 * Description: This plugin is used to provide all helper functions and some other functionality for wordpress websites.
 */

/*
mkdir -p wp-content/mu-plugins/mu-singh && cd wp-content/mu-plugins/mu-singh && composer require digitalnature/php-ref filp/whoops && cd ../../../
*/

defined('ABSPATH') || exit;

if (file_exists(__DIR__ . "/mu-singh/vendor/autoload.php")) {
    require_once __DIR__ . "/mu-singh/vendor/autoload.php";
    // ref::config('showPrivateMembers', true);
    // ref::config('showIteratorContents', true);
}

if (class_exists('Whoops\Run')) {
    // Only check debug condition if host does NOT contain any of these
    $excluded_hosts = ['localhost', '.test', '.dev', 'staging.', '.staging', '.local', '.acer', 'singhs.work'];
    $should_check_debug = true;
    foreach ($excluded_hosts as $excluded) {
        if (strpos($_SERVER['HTTP_HOST'] ?? '', $excluded) !== false) {
            $should_check_debug = false;
            break;
        }
    }

    if (!($should_check_debug && (!defined('WP_DEBUG') || !WP_DEBUG))) {
        if (!($should_check_debug && defined('WP_DEBUG_DISPLAY') && !WP_DEBUG_DISPLAY)) {
            $_whoops = new \Whoops\Run();
            $_whoops->pushHandler(new \Whoops\Handler\PrettyPageHandler);
            $_whoops->silenceErrorsInPaths('/.*/', E_WARNING | E_NOTICE);
            // $_whoops->pushHandler(new \Whoops\Handler\JsonResponseHandler());
            $_whoops->register();
        }
    }
}

// helper functions copy from https://gist.github.com/pritdeveloper/6c1b3ba4770731fc48fb6fbd329b1430/raw

/**
 * This is used to change all the URLs to use the original domain url
 * instead of the cloned server url for all the attachments
 */
function mu_singh_check_url($url)
{
    $new_domain = '';
    $old_domain = '';
    if (!function_exists('curl_init') || !$new_domain || !$old_domain) return $url;

    $wp_upload_dir = wp_upload_dir();
    $urls_file = '.mu_singh_urls__';
    $urls_file_path = untrailingslashit($wp_upload_dir['basedir']) . "/{$urls_file}";

    // Ensure the file exists
    if (!file_exists($urls_file_path)) {
        @touch($urls_file_path);
    }

    $f_contents = file_get_contents($urls_file_path);
    $urls = maybe_unserialize($f_contents);
    if (!is_array($urls)) {
        $urls = array();
    }

    $md5 = md5($url);
    if (isset($urls[$md5])) return $urls[$md5];

    // Perform cURL HEAD request
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_NOBODY, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 5);
    curl_exec($ch);
    $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);

    // If not 200, switch to old domain
    if ($code !== 200) {
        $url = str_replace(untrailingslashit($new_domain), untrailingslashit($old_domain), $url);
    }

    $urls[$md5] = $url;

    // Save updated cache
    file_put_contents($urls_file_path, maybe_serialize($urls));

    return $url;
}

add_filter('wp_get_attachment_url', function ($url) {
    return mu_singh_check_url($url);
});

// Modify each srcset entry
add_filter('wp_calculate_image_srcset', function ($sources) {
    foreach ($sources as $width => &$source) {
        $source['url'] = mu_singh_check_url($source['url']);
    }
    return $sources;
});