怎麼用socket_set_option 設置socket 的重傳次數來優化網絡穩定性？

gitbox 2025-08-17
<span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-comment">// 文章開始前部分內容</span></span><span>
</span><span><span class="hljs-comment">// 與文章主題無關的代碼或註釋</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">// 文章正文部分開始</span></span><span>

<span class="hljs-comment">/**
 * 如何使用 socket_set_option 設定 socket 的重傳次數來優化網絡穩定性
 *
 * 在網絡編程中，socket 是一種非常常見的通信機制，它允許不同的進程或設備通過網絡進行數據交換。在使用 socket 進行網絡通信時，傳輸穩定性是一個重要的考慮因素，尤其是在不穩定或高延遲的網絡環境中。為了提高網絡通信的可靠性，我们可以通过設定 socket 的重傳次數來優化網絡穩定性。
 *
 * 本文將介紹如何使用 PHP 中的 `socket_set_option` 函数設定 socket 的重傳次數，來提升網絡連接的穩定性。
 */</span>

 </span><span><span class="hljs-comment">// 創建一個 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">"創建 socket 失敗: "</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">// 連接到目標地址和端口</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">"连接失敗: "</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">// 設定 socket 選項</span></span><span>
</span><span><span class="hljs-comment">// 这里我们設定 SO_RCVBUF 和 SO_RCVBUF 重传次数相关的選項</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">// 設定重传次数为 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">"設定接收缓冲区失敗: "</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">"設定重传次数失敗: "</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">// 發送數據</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">// 關閉 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">// 文章正文部分結束</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">// 文章結束後部分內容</span></span><span>
</span><span><span class="hljs-comment">// 任何結束標記或註釋</span></span><span>
</span><span><span class="hljs-meta">?&gt;</span></span><span>
</span></span>
socket_set_option