php socket获取数据类

<?php
define("CONNECTED", true);
define("DISCONNECTED", false);

/**
 * Socket class
 * 
 *  
 * @author ZT
 */
Class Socket
{
    private static $instance;

    private $connection = null;
    
    private $connectionState = DISCONNECTED;
    
    private $defaultHost = "127.0.0.1";
    
    private $defaultPort = 80;
    
    private $defaultTimeout = 20;
    
    public  $debug = false;
    
    function __construct()
    {
        
    }
    /**
     * Singleton pattern. Returns the same instance to all callers
     *
     * @return Socket
     */
    public static function singleton()
    {
        if (self::$instance == null || ! self::$instance instanceof Socket)
        {
            self::$instance = new Socket();
           
        }
        return self::$instance;
    }
    /**
     * Connects to the socket with the given address and port
     * 
     * @return void
     */
    public function connect($serverHost=false, $serverPort=false, $timeOut=false)
    {        
        if($serverHost == false)
        {
            $serverHost = $this->defaultHost;
        }
        
        if($serverPort == false)
        {
            $serverPort = $this->defaultPort;
        }
        $this->defaultHost = $serverHost;
        $this->defaultPort = $serverPort;
        
        if($timeOut == false)
        {
            $timeOut = $this->defaultTimeout;
        }
        $this->connection = socket_create(AF_INET,SOCK_STREAM,SOL_TCP); 
        
        if(socket_connect($this->connection,$serverHost,$serverPort) == false)
        {
            $errorString = socket_strerror(socket_last_error($this->connection));
            $this->_throwError("Connecting to {$serverHost}:{$serverPort} failed.<br>Reason: {$errorString}");
        }else{
            $this->_throwMsg("Socket connected!");
        }
        
        $this->connectionState = CONNECTED;
    }
    
    /**
     * Disconnects from the server
     * 
     * @return True on succes, false if the connection was already closed
     */
    public function disconnect()
    {
        if($this->validateConnection())
        {
            socket_close($this->connection);
            $this->connectionState = DISCONNECTED;
            $this->_throwMsg("Socket disconnected!");
            return true;
        }
        return false;
    }
    /**
     * Sends a command to the server
     * 
     * @return string Server response
     */
    public function sendRequest($command)
    {
        if($this->validateConnection())
        {
            $result = socket_write($this->connection,$command,strlen($command));
            return $result;
        }
        $this->_throwError("Sending command \"{$command}\" failed.<br>Reason: Not connected");
    }
    
    
    
    public function isConn()
    {
        return $this->connectionState;
    }
    
    
    public function getUnreadBytes()
    {
        
        $info = socket_get_status($this->connection);
        return $info[‘unread_bytes‘];

    }

    
    public function getConnName(&$addr, &$port)
    {
        if ($this->validateConnection())
        {
            socket_getsockname($this->connection,$addr,$port);
        }
    }
    
   
    
    /**
     * Gets the server response (not multilined)
     * 
     * @return string Server response
     */
    public function getResponse()
    {
        $read_set = array($this->connection);
    
        while (($events = socket_select($read_set, $write_set = NULL, $exception_set = NULL, 0)) !== false) 
        {
            if ($events > 0)
            {
                foreach ($read_set as $so)
                {
                    if (!is_resource($so))
                    {
                        $this->_throwError("Receiving response from server failed.<br>Reason: Not connected");
                        return false;
                    }elseif ( ( $ret = @socket_read($so,4096,PHP_BINARY_READ) ) == false){
                        $this->_throwError("Receiving response from server failed.<br>Reason: Not bytes to read");
                        return false;
                    }
                    return $ret;
                }
            }
        }
        
        return false;
    }
    public function waitForResponse()
    {
        if($this->validateConnection())
        {
            $socketResponse = "";
            while($val = socket_read($this->connection, 1024)){
                $socketResponse .= $val;
            }
            return $socketResponse;
        }
        
        $this->_throwError("Receiving response from server failed.<br>Reason: Not connected");
    return false;
    }
    /**
     * Validates the connection state
     * 
     * @return bool
     */
    private function validateConnection()
    {
        return (is_resource($this->connection) && ($this->connectionState != DISCONNECTED));
    }
    /**
     * Throws an error
     * 
     * @return void
     */
    private function _throwError($errorMessage)
    {
        echo "Socket error: " . $errorMessage;
    }
    /**
     * Throws an message
     * 
     * @return void
     */
    private function _throwMsg($msg)
    {
        if ($this->debug)
        {
            echo "Socket message: " . $msg . "\n\n";
        }
    }
    /**
     * If there still was a connection alive, disconnect it
     */
    public function __destruct()
    {
        $this->disconnect();
    }
}

function send_socket($req, $ip, $port){
    $byte = new Bytes();
    $req_bytes = $byte->getbytes($req);
    $req_trans = $byte->tostr($req_bytes);
    $req_length = strlen($req_trans);
    $pack = pack("a{$req_length}", $req_trans);
    
    $socket = Socket::singleton();
    $socket->connect($ip, $port);
    $socket->sendRequest($pack);
    
    $socket_result = $socket->waitForResponse();
    
    $socket->disconnect();
    return $socket_result;
}

var_dump(send_socket("test", "127.0.0.1", 443));