PHPでサーバーポートのスキャンと検出を実装する方法

<?php 
class Health { 
  public static $status; 
  public function __construct() 
  { 
  } 
  public function check($ip, $port){ 
    $sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); 
    socket_set_nonblock($sock); 
    socket_connect($sock,$ip, $port); 
    socket_set_block($sock); 
    self::$status = socket_select($r = array($sock), $w = array($sock), $f = array($sock), 5); 
    return(self::$status);  
  } 
  public function checklist($lst){ 
  } 
  public function status(){ 
    switch(self::$status) 
    { 
      case 2: 
        echo "Closed\\n"; 
        break; 
      case 1: 
        echo "Openning\\n"; 
        break; 
      case 0: 
        echo "Timeout\\n"; 
        break; 
    }   
  } 
} 
$ip=&#39;192.168.2.10&#39;; 
$port=80; 
$health = new Health(); 
$health->check($ip, $port); 
$health->status();