如何在脚本中关闭套接字连接？

Question

我使用SocketServer.class.php从GPS跟踪单元到我的服务器进行连接。发生什么事的一个简单例子。

单元连接到我的服务器，建立连接并将数据/缓冲区发送到服务器，并且设备断开连接，这告诉套接字关闭。但是在某些版本的设备上，设备不会关闭连接，插座保持打开状态，然后阻止连接和发送信息的其他设备的过程。我可以用什么PHP代码在幕后时间关闭连接/套接字或在一段时间后执行套接字超时？

因为这给我带来了两个问题。我可以拥有一个或另一个。 1）发送/接收第一批信息后关闭连接。但是单元有时发送的信息是在3缓冲区发送（希望我说的正确）所以现在我保持连接/套接字打开并等待单元说“我已经完成，关闭套接字”。这很好。但是，当该单元没有说“我已经完成”并且套接字保持打开但收到所有信息时，问题就出现了。  这是我的代码：

<?php
class SocketServer
{
    protected $config;
    protected $master_socket;
    public $max_clients = 99999;
    public $max_read = 32768;
    public $clients;
    public $complete_string = "";

    public function __construct($bind_ip,$port)
    {
        set_time_limit(0);
        $this->hooks = array();

        $this->config["ip"] = $bind_ip;
        $this->config["port"] = $port;

        $this->master_socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
        socket_bind($this->master_socket,$this->config["ip"],$this->config["port"]) or die("Port ".$this->config["port"]." is still open\r\n");
        socket_getsockname($this->master_socket,$bind_ip,$port);
        socket_listen($this->master_socket);
        SocketServer::debug("Listenting for connections on {$bind_ip}:{$port}");
    }

    public function loop_once()
    {
        // Setup Clients Listen Socket For Reading
        $read[0] = $this->master_socket;
        for($i = 1; $i <= $this->max_clients; $i++)
        {
            if(isset($this->clients[$i]))
            {
                $read[$i + 1] = $this->clients[$i]->socket;
            }
        }


        // Set up a blocking call to socket_select
        if(socket_select($read,$write = NULL, $except = NULL, $tv_sec = 8) < 1)
        {
            return true;
        }

        // Handle new Connections
        if(in_array($this->master_socket, $read))
        {
            for($i = 1; $i <= $this->max_clients; $i++)
            {
                if(empty($this->clients[$i]))
                {
                    $temp_sock = $this->master_socket;
                    $this->clients[$i] = new SocketServerClient($this->master_socket,$i);
                    SocketServer::debug("Client {$i} from {$this->clients[$i]->ip} connected @ ".date("d-M-Y H:i:s"), time());
                    break;
                }
                elseif($i == ($this->max_clients-1))
                {
                    SocketServer::debug("Too many clients... :( ");
                }
            }

        }

        // Handle Input
            for($i = 0; $i < $this->max_clients; $i++) // for each client
            {
                if(isset($this->clients[$i]))
                {
                    if(in_array($this->clients[$i]->socket, $read))
                    {
                        $input = socket_read($this->clients[$i]->socket, $this->max_read);
                        if($input == null)
                        {
                            $this->disconnect($i);
                        }
                        else
                        {

                            $this->clients[$i]->complete_string .= $input;
                        }
                    }
                }
            }
            return true;
    }

    public function disconnect($client_index,$message = "")
    {
        $i = $client_index;
        SocketServer::debug("Lets interpret the string\r\n");
        SocketServer::interpret();
        SocketServer::debug("Client {$i} from {$this->clients[$i]->ip} disconnected");
        SocketServer::debug("------------------------------------------------------------------------------------------------------------------------------------------");
        $this->clients[$i]->destroy();
        unset($this->clients[$i]);  
    }       

    public function interpret()
    {
        //Lets get the info to start
        for($i = 0; $i < $this->max_clients; $i++) // for each client
        {
            if(isset($this->clients[$i]))
            {
                $complete_string = $this->clients[$i]->complete_string;
                SocketServer::debug($complete_string);
                //Do something with the string here

                //Clear the Complete String Variable for next use
                $this->clients[$i]->complete_string = "";
            }
        }
    }

    public function infinite_loop()
    {
        $test = true;
        do
        {
            $test = $this->loop_once();
        }
        while($test);
    }

    public static function debug($text)
    {
        echo("{$text}\r\n");

    }

    function &__get($name)
    {
        return $this->{$name};
    }
}

class SocketServerClient
{
    protected $socket;
    protected $ip;
    protected $hostname;
    protected $server_clients_index;

    public function __construct(&$socket,$i)
    {
        $this->server_clients_index = $i;
        $this->socket = socket_accept($socket) or die("Failed to Accept");
        socket_getpeername($this->socket,$ip);
        $this->ip = $ip;
    }

    public function lookup_hostname()
    {
        $this->hostname = gethostbyaddr($this->ip);
        return $this->hostname;
    }

    public function destroy()
    {
        socket_close($this->socket);
    }

    function &__get($name)
    {
        return $this->{$name};
    }

    function __isset($name)
    {
        return isset($this->{$name});
    }
}