怎么用 socket_set_option 设置 socket 的重传次数来优化网络稳定性？

gitbox 2025-08-17
<span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-comment">// 文章开始前部分内容</span></span><span>
</span><span><span class="hljs-comment">// 与文章主题无关的代码或注释</span></span><span>
</span><span><span class="hljs-meta">?&gt;</span></span><span>
----------------------------------------------
</span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-comment">// 文章正文部分开始</span></span><span>

<span class="hljs-comment">/**
 * 如何使用 socket_set_option 设置 socket 的重传次数来优化网络稳定性
 *
 * 在网络编程中，socket 是一种非常常见的通信机制，它允许不同的进程或设备通过网络进行数据交换。在使用 socket 进行网络通信时，传输稳定性是一个重要的考虑因素，尤其是在不稳定或高延迟的网络环境中。为了提高网络通信的可靠性，我们可以通过设置 socket 的重传次数来优化网络稳定性。
 *
 * 本文将介绍如何使用 PHP 中的 `socket_set_option` 函数设置 socket 的重传次数，来提升网络连接的稳定性。
 */</span>

 </span><span><span class="hljs-comment">// 创建一个 TCP socket</span></span><span>
</span><span><span class="hljs-variable">$socket</span></span><span> = </span><span><span class="hljs-title function_ invoke__">socket_create</span></span><span>(AF_INET, SOCK_STREAM, SOL_TCP);
</span><span><span class="hljs-keyword">if</span></span><span> (!</span><span><span class="hljs-variable">$socket</span></span><span>) {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"创建 socket 失败: "</span></span><span> . </span><span><span class="hljs-title function_ invoke__">socket_strerror</span></span><span>(</span><span><span class="hljs-title function_ invoke__">socket_last_error</span></span><span>()) . </span><span><span class="hljs-string">"\n"</span></span><span>;
    </span><span><span class="hljs-keyword">exit</span></span><span>();
}

</span><span><span class="hljs-comment">// 连接到目标地址和端口</span></span><span>
</span><span><span class="hljs-variable">$address</span></span><span> = </span><span><span class="hljs-string">'127.0.0.1'</span></span><span>;
</span><span><span class="hljs-variable">$port</span></span><span> = </span><span><span class="hljs-number">12345</span></span><span>;
</span><span><span class="hljs-keyword">if</span></span><span> (!</span><span><span class="hljs-title function_ invoke__">socket_connect</span></span><span>(</span><span><span class="hljs-variable">$socket</span></span><span>, </span><span><span class="hljs-variable">$address</span></span><span>, </span><span><span class="hljs-variable">$port</span></span><span>)) {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"连接失败: "</span></span><span> . </span><span><span class="hljs-title function_ invoke__">socket_strerror</span></span><span>(</span><span><span class="hljs-title function_ invoke__">socket_last_error</span></span><span>()) . </span><span><span class="hljs-string">"\n"</span></span><span>;
    </span><span><span class="hljs-keyword">exit</span></span><span>();
}

</span><span><span class="hljs-comment">// 设置 socket 选项</span></span><span>
</span><span><span class="hljs-comment">// 这里我们设置 SO_RCVBUF 和 SO_RCVBUF 重传次数相关的选项</span></span><span>
</span><span><span class="hljs-variable">$transmit_retries</span></span><span> = </span><span><span class="hljs-number">5</span></span><span>; </span><span><span class="hljs-comment">// 设置重传次数为 5</span></span><span>

</span><span><span class="hljs-keyword">if</span></span><span> (!</span><span><span class="hljs-title function_ invoke__">socket_set_option</span></span><span>(</span><span><span class="hljs-variable">$socket</span></span><span>, SOL_SOCKET, SO_RCVBUF, </span><span><span class="hljs-number">65536</span></span><span>)) {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"设置接收缓冲区失败: "</span></span><span> . </span><span><span class="hljs-title function_ invoke__">socket_strerror</span></span><span>(</span><span><span class="hljs-title function_ invoke__">socket_last_error</span></span><span>()) . </span><span><span class="hljs-string">"\n"</span></span><span>;
    </span><span><span class="hljs-keyword">exit</span></span><span>();
}

</span><span><span class="hljs-keyword">if</span></span><span> (!</span><span><span class="hljs-title function_ invoke__">socket_set_option</span></span><span>(</span><span><span class="hljs-variable">$socket</span></span><span>, SOL_SOCKET, SO_RCVBUF, </span><span><span class="hljs-variable">$transmit_retries</span></span><span>)) {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"设置重传次数失败: "</span></span><span> . </span><span><span class="hljs-title function_ invoke__">socket_strerror</span></span><span>(</span><span><span class="hljs-title function_ invoke__">socket_last_error</span></span><span>()) . </span><span><span class="hljs-string">"\n"</span></span><span>;
    </span><span><span class="hljs-keyword">exit</span></span><span>();
}

</span><span><span class="hljs-comment">// 发送数据</span></span><span>
</span><span><span class="hljs-variable">$message</span></span><span> = </span><span><span class="hljs-string">"Hello, this is a test message!"</span></span><span>;
</span><span><span class="hljs-title function_ invoke__">socket_write</span></span><span>(</span><span><span class="hljs-variable">$socket</span></span><span>, </span><span><span class="hljs-variable">$message</span></span><span>, </span><span><span class="hljs-title function_ invoke__">strlen</span></span><span>(</span><span><span class="hljs-variable">$message</span></span><span>));

</span><span><span class="hljs-comment">// 关闭 socket</span></span><span>
</span><span><span class="hljs-title function_ invoke__">socket_close</span></span><span>(</span><span><span class="hljs-variable">$socket</span></span><span>);

</span><span><span class="hljs-comment">// 文章正文部分结束</span></span><span>
</span><span><span class="hljs-meta">?&gt;</span></span><span>
----------------------------------------------
</span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-comment">// 文章结束后部分内容</span></span><span>
</span><span><span class="hljs-comment">// 任何结束标记或注释</span></span><span>
</span><span><span class="hljs-meta">?&gt;</span></span><span>
</span></span>
socket_set_option