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