现在的PYTHON很火，但是我们的PHP也不错！主要是看有没有去挖掘它，去在phper中开更多的脑洞，有时学习框架学累的时候，不妨写写脚本。或许能帮助自己更好的了解PHP。
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这里我们就不阐述Socket套接字）是什么了，这里我们使用常见的C(client)/S(server)模式。作为服务器端，它的操作socket流程如下:
下面是Server.php的代码
<ol class="dp-c"><li class="alt"><span><span>#The script is used to listen the requests from client </span></span></li><li><span><span class="func">error_reporting</span><span>(E_ALL & ~E_NOTICE); </span></span></li><li class="alt"><span><span class="vars">$ip</span><span> = </span><span class="string">'127.0.0.1'</span><span>; </span></span></li><li><span><span class="vars">$port</span><span> = 1993; </span></span></li><li class="alt"><span><span class="vars">$sock</span><span> = socket_create(AF_INET,SOCK_STREAM,SOL_TCP); </span></span></li><li><span><span class="keyword">if</span><span>(!</span><span class="vars">$sock</span><span>){ </span></span></li><li class="alt"><span><span class="func">echo</span><span> </span><span class="string">'In create process'</span><span>.socket_strerror(socket_last_error); </span></span></li><li><span>} </span></li><li class="alt"><span><span class="vars">$bind_ornot</span><span> = socket_bind(</span><span class="vars">$sock</span><span>,</span><span class="vars">$ip</span><span>,</span><span class="vars">$port</span><span>); </span></span></li><li><span><span class="keyword">if</span><span>(!</span><span class="vars">$bind_ornot</span><span>) </span></span></li><li class="alt"><span>{ </span></li><li><span><span class="func">echo</span><span> </span><span class="string">'In bind process:'</span><span>.socket_strerror(socket_last_error(</span><span class="vars">$sock</span><span>)); </span></span></li><li class="alt"><span><span class="keyword">return</span><span> 0; </span></span></li><li><span>} </span></li><li class="alt"><span><span class="keyword">if</span><span>(socket_listen(</span><span class="vars">$sock</span><span>,10)){ </span></span></li><li><span><span class="vars">$flag</span><span> = 1; </span></span></li><li class="alt"><span><span class="keyword">do</span><span>{ </span></span></li><li><span><span class="vars">$conn_socket</span><span> = socket_accept(</span><span class="vars">$sock</span><span>); </span></span></li><li class="alt"><span><span class="vars">$msg</span><span> = </span><span class="string">"Send Message:Hello,World"</span><span>; </span></span></li><li><span><span class="keyword">if</span><span>(socket_write(</span><span class="vars">$conn_socket</span><span>,</span><span class="vars">$msg</span><span>,</span><span class="func">strlen</span><span>(</span><span class="vars">$msg</span><span>))) </span></span></li><li class="alt"><span>{ </span></li><li><span><span class="func">echo</span><span> </span><span class="string">"第{$flag}次:发送成功\n"</span><span>; </span></span></li><li class="alt"><span>}; </span></li><li><span><span class="keyword">if</span><span>(</span><span class="vars">$flag</span><span> == 5) </span></span></li><li class="alt"><span>{ </span></li><li><span><span class="func">echo</span><span> </span><span class="string">"停止监听，发送完成"</span><span>; </span></span></li><li class="alt"><span><span class="keyword">break</span><span>; </span></span></li><li><span>} </span></li><li class="alt"><span><span class="vars">$flag</span><span>++; </span></span></li><li><span>socket_close(<span class="vars">$conn_socket</span><span>); </span></span></li><li class="alt"><span>}<span class="keyword">while</span><span>(True); </span></span></li><li><span>} </span></li><li class="alt"><span>?> </span></li></ol>socket_create函数是用来创建一个socket资源，它有三个参数，第一个参数指的是协议族，其中AF_INET指的是使用ipv4的协议族，第二个参数是指使用的通信类型，SOCK_STREAM指的是流模式。流模式对应的是可靠连接，也就是tcp连接方式。第三个指的是选用哪一种连接方式，要是tcp就是用SOL_TCP.要是udp就使用SOL_UDP。对于socket_listen，第一个参数是要监听的套接字，第二个是可允许的队列数目，即允许有多少个人连接。但在使用前得先绑定一个ip地址和端口上面的php代码，监听本地环路地址‘127.0.0.1’的1993端口，只要有连接请求发送到1993端口，便与客户端建立tcp连接，之后便是发送信息到客户端，发送完消息之后便关闭连接。里面的flag为计数标志变量，当$flag为5的时候，停止建立连接。PS:socket_strerror(socket_last_error($sock))返回的是对应套接字产生错误的原因，编码是根据操作系统所使用的语言，我这里是windows的中文系统，所以返回的是gbk编码！接下来是client.php操作socket的流程。
下面是代码：
<ol class="dp-c"><li class="alt"><span><span class="func">error_reporting</span><span>(E_ALL & ~E_NOTICE); </span></span></li><li><span><span class="vars">$sock</span><span> = socket_create(AF_INET,SOCK_STREAM,SOL_TCP); </span></span></li><li class="alt"><span><span class="keyword">if</span><span>(</span><span class="vars">$sock</span><span>){ </span></span></li><li><span><span class="keyword">if</span><span>(socket_connect(</span><span class="vars">$sock</span><span>,</span><span class="string">'127.0.0.1'</span><span>,1993)) </span></span></li><li class="alt"><span>{ </span></li><li><span><span class="keyword">while</span><span>((</span><span class="vars">$content</span><span> = socket_read(</span><span class="vars">$sock</span><span>,256))) </span></span></li><li class="alt"><span>{ </span></li><li><span><span class="func">echo</span><span> </span><span class="vars">$content</span><span>.</span><span class="string">"\n"</span><span>; </span></span></li><li class="alt"><span>} </span></li><li><span>} </span></li><li class="alt"><span><span class="keyword">else</span><span> </span></span></li><li><span>{ </span></li><li class="alt"><span><span class="func">echo</span><span> </span><span class="string">'In connect process'</span><span>.socket_strerror(socket_last_error); </span></span></li><li><span>} </span></li><li class="alt"><span>} </span></li><li><span><span class="keyword">else</span><span> </span></span></li><li class="alt"><span>{ </span></li><li><span><span class="func">echo</span><span> </span><span class="string">'In create process'</span><span>.socket_strerror(socket_last_error(</span><span class="vars">$sock</span><span>)); </span></span></li><li class="alt"><span>} </span></li><li><span>?> </span></li></ol>上面的代码使用socket_connect连接到正在监听的服务器端口1993，连接后，通过socket_read从连接后的套接字读取内容！返回的由于是字符串类型，可以直接打印！之后我们先运行server.php，因为其负责监听指定端口和发送信息。倘若我们先运行client.php，那我们便会发现返回这样的错误！
