Nginx Cache Controller で複数サーバのキャッシュ消す奴

nginx_flush_cache.php

<?php
function nginx_flush_cache( $url ) {
    global $nginx_servers;
    static $urls = array();
    if ( !$url )
        return;
    if ( isset($urls[md5($url)]) )
        return;
    $urls[md5($url)] = $url;
    $log_file = '/tmp/nginx_flush_cache.log';

    if (!isset($nginx_servers)) {
        $nginx_servers = array(
            '192.168.0.1',
            '192.168.0.2',
            );
    }
    foreach ( $nginx_servers as $server ) {
        $response = wp_remote_get('http://'.$server.'/purge/?url=' . rawurlencode($url));
        if( !is_wp_error( $response ) && $response["response"]["code"] === 200 ) {
            // 成功時の処理
            //file_put_contents($log_file, "{$server} : {$url}\n", FILE_APPEND);
        } else {
            // エラー時の処理
            file_put_contents($log_file, "{$server}\n", FILE_APPEND);
        }
    }
}
add_action('nginxchampuru_flush_cache', 'nginx_flush_cache');