php socket编程|网络字节序,大端序|workerman-PHP源码-php.cn

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php socket编程|网络字节序,大端序|workerman

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May 26, 2016 am 08:20 AM

<?php
//网络字节序是指大端序，TCP/IP都是采用网络字节序的方式。

//======================================================================================================//

//n -- 无符号短整数 (16位, 大端字节序)

$str = &#39;test.string&#39;;
$pack = pack(&#39;n&#39;, strlen($str));

echo strlen($pack); // 2个字节，此值是确定的

$unpack = unpack(&#39;nLen&#39;, $pack); // Len相当于定义的一个变量，返回值为打包时的长度

echo $unpack[&#39;Len&#39;];  // 等于strlen($str) 11个字节

//exit;

//======================================================================================================//

//N -- 无符号长整数 (32位, 大端字节序)

$str = &#39;test.string&#39;;
$pack = pack(&#39;N&#39;, strlen($str));

echo strlen($pack); // 4个字节，此值是确定的

$unpack = unpack(&#39;NLen&#39;, $pack); // Len相当于定义的一个变量，返回值为打包时的长度

echo $unpack[&#39;Len&#39;];  // 等于strlen($str) 11个字节

exit;


//======================================================================================================//

//如果提供socket服务方定义的
//请求边界标识的长度为2，则用unsigned 16位的 ‘n’
//请求边界标识的长度为4，则用unsigned 32位的 ‘N’
//那么整个包体为 【网络字节序】+数据包实体，附加发送的长度参数为：【数据包实体长度+网络字节序长度】

$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
$connect = socket_connect($socket, &#39;192.168.1.10&#39;, 55660);

$buffer = &#39;我是数据包实体&#39;;
$length = strlen($buffer);
$pack = pack("N", $length + 4);
socket_write($socket, $pack.$buffer, $length + 4);

//同样unpack出来的lenght也是等于strlen($buffer)+4
//那么socket_read之后的返回数据包就需要去掉4个长度就可以了

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$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
$conn = socket_connect($socket, &#39;192.168.1.10&#39;, 55660);

$buffer = &#39;test.string&#39;;
$len = strlen($buffer);
echo &#39;buffter length: &#39;.$len.&#39;
&#39;;
$pack = pack(&#39;n&#39;, $len + 2);
$send = socket_write($socket, $pack.$buffer, $len + 2);
if($send){
	echo &#39;send ok
&#39;;	
}

$read = socket_read($socket, 10240);

echo &#39;read data:&#39;.$read .&#39;
&#39;;
echo &#39;read length:&#39;.strlen($read).&#39;
&#39;;
echo &#39;real data is:&#39;.substr($read, 2);

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<?php
class AndyHua extends Man\Core\SocketWorker{
	
    public function dealInput($recv){
        //目前已经收到的长度
		$len = strlen($recv);
		//preread_length = 2
		if($len < 2){
			return 2 - $len;	
		}
		$t = unpack(&#39;nLen&#39;, $recv);
		//Len为包的实际长度
		return $t[&#39;Len&#39;] - $len; 
		//如果$t[&#39;Len&#39;]等于$len那就说明已经接收完了
    }

    public function dealProcess($recv){

		return $this->sendToClient($recv);
		//return $this->sendToClient(substr($recv, 2));
		
    }
	
}

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