$file = "c:/91yunying.com-access.log";
    $content = file_get_contents($file);
    $ip_list = [];
    preg_match_all(
        '/\d+\.\d+\.\d+\.\d+/',
        $content,
        $matches);
    $ip_list = $matches[0];
    $ip_list = array_unique($ip_list);
    $ip_list = array_values($ip_list);
    print_r($ip_list);