1. [代码]在线端口扫描工具（http://www.atool.org/port_scanner.php）

端口扫描器可以用于检查VPS服务器端口是否开放，对于网站和服务器的安全非常重要。

class Health {public static $status;public function __construct() {}public function check($ip, $port, $timeout = 2){$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), 2);return(self::$status); }public function status(){switch(self::$status){case 2:return "Closed";break;case 1:return "Openning";break;case 0:return "Closed";break;}}}

2. [图片] _E6_9C_AA_E5_91_BD_E5_90_8D.png