该程序可以确认当前端口是否可用：
<?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='192.168.2.10'; $port=80; $health = new Health(); $health->check($ip, $port); $health->status();