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
