PHP 應用之一 socket funion ：偽 WEB Server

php 應用之一 socket funion
黃志賢 hoyo
www.hoyo.idv.tw

應用系列說明
Socket Functions
Filesystem Functions
Output Control Functions
Process Control Functions
Shared Memory and IPC Functions
截至目前有 182 個函式庫

第一階段：Socket
了解 Server / Client 在通訊時的差別
了解 TCP / UDP 的特性
可以建立 Client 連線到 Server 要求資料
可以建立 Server Listen 環境提供服務
應用一：偽 web server

第二階段：Server Push
了解 Server Push 的特性
透過記憶體交換達到即時效果
:
:
應用二：php 聊天室

Socket Function
socket_ accept
socket_ bind
socket_ close
socket_ connect
socket_ create
socket_ listen
socket_ read
socket_ recv
socket_ recvfrom
socket_ send
socket_ sendto
socket_ shutdown
socket_ write

TCP Client
建立
$socket = @socket_create ( AF_INET,SOCK_STREAM, SOL_TCP);
@socket_connect( $socket, $ipaddress, $port );
怎麼問
socket_write($socket,$command,strlen( $command ));
怎麼收
$read = @socket_read ($socket, 64);

TCP Server
建立
$socket = socket_create ( AF_INET, SOCK_STREAM, SOL_TCP );
socket_bind ( $socket, $address, $port );
socket_listen ( $socket );
怎麼等
$msgsock = @socket_accept ( $socket ); while( $buff = @socket_read ( $msgsock, 1024 ) ) { }
怎麼回
socket_send( $msgsock, $desc, strlen($desc), 0 );

UDP Client
建立
$sock_udp = socket_create( AF_INET, SOCK_DGRAM, SOL_UDP );
怎麼丟
socket_sendto($sock_udp, $temp, strlen($temp), 0, '239.255.255.250', 1900);

UDP Server
建立
$socket = socket_create( AF_INET, SOCK_DGRAM, SOL_UDP);
socket_bind ( $socket, $address, $port );
死命的收
while (1) { @socket_recvfrom( $socket, $buffer, 2048, 0, $clientip, $clientport );
}

實作 HyperText Transfer Protocol
http://www.w3.org/Protocols/

Internet Explorer 6.0
GET / HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shock
wave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application
/msword, */*
Accept-Language: zh-tw
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; Med
ia Center PC 3.0; .NET CLR 1.0.3705)
Host: 127.0.0.1:800
Connection: Keep-Alive

Firefox 2.0
GET / HTTP/1.1
Host: 127.0.0.1:800
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-TW; rv:1.8.1.1) Gecko/20
061204 Firefox/2.0.0.1
Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plai
n;q=0.8,image/png,*/*;q=0.5
Accept-Language: zh-tw,en-us;q=0.7,en;q=0.3
Accept-Encoding: gzip,deflate
Accept-Charset: Big5,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive

使用 netstat 檢視連線狀態

HTTP 通訊流程
瀏覽器
WEB Server
判斷想要取得的檔案
將設定的首頁傳回

HTTP 通訊流程
瀏覽器
WEB Server
Listen Port ex:800
將設定的首頁傳回
Open Port ex:1217
在未設定下，Client 和 server 通訊時，
會使用那一個 port 是無法預期的

參考資源
TCP 與 UDP http://www.study-area.org/network/network_ip_tcp.htm
TCP/IP 工作模型 http://www.study-area.org/network/network_ip_model.htm

參考工具
netstat :: 得知連線狀態
echo :: 顯示程式結果
What Is Transferring :: TCP/UDP
Ethereal :: ALL (UPnP)

PHP 應用之一 socket funion ：偽 WEB Server

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