PHP file to send responses, parse request and etc.

server.php

<?php
if(!function_exists("server")) {
  function server() {
    return new Server(func_get_args());
  }
}
class Server {
  private CONST SERVICES    = ["www","http","https","mysql","smtp","imap","pop3","ftp","ssh","sftp","telnet","nicname","gopher","finger"];
  private CONST PROTOCOL    = ["tcp","udp"];
  private CONST VALID_KEYS  = ["all"=>"a","os"=>"s","release"=>"r","version"=>"v","bits"=>"m","hostname"=>"n"];
    private $protocol = $_SERVER['SERVER_PROTOCOL'];
    private $port     = $_SERVER['SERVER_PORT'];
  private function __construct()
  {
    var_dump(posix_geteuid());
    var_dump(get_current_user());
    var_dump(getmyuid());
    var_dump(exec('whoami'));
    var_dump(gethostname())
  }

  function getInfo($key) {
    if(!array_key_exists($key,Server::$VALID_KEYS)){
      throw new Exception("$key is invalid! Please enter a value from ".print_r(Server::VALID_KEYS,true),422);
    }
    return php_uname(Server::$VALID_KEYS[$key]);
  }
  function port($serviceName) {
    foreach (Server::SERVICES as $service) {
      $port = getservbyname($service, 'tcp');
      echo $service . ":- " . $port . "<br />\n";
    }
  }
  function php_extns_loaded() {
    return get_loaded_extensions();
  }
  function php_extn_isLoaded($name=null) {
    return extension_loaded($name);
  }
}