curl_init 與curl_setopt 實現文件下載進度回調

<span><span><span class="hljs-meta"><?php</span></span><span>
</span><span><span class="hljs-comment">// 前言部分，與正文內容無關</span></span><span>
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"這是一個示例程序，用於演示PHP中的基本輸出和函數使用。<br>"</span></span><span>;
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"程序開始執行...<br>"</span></span><span>;
</span><span><span class="hljs-comment">// 更多無關代碼</span></span><span>
</span><span><span class="hljs-function"><span class="hljs-keyword">function</span></span></span><span> </span><span><span class="hljs-title">dummyFunction</span></span><span>(</span><span><span class="hljs-params"></span></span><span>) {
    </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-string">"這只是一個佔位函數，與文章主題無關。"</span></span><span>;
}
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-title function_ invoke__">dummyFunction</span></span><span>();
</span><span><span class="hljs-meta">?></span></span><span>

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</span><span><span class="hljs-meta"><?php</span></span><span>
<span class="hljs-comment">/*
文章正文: curl_init 與 curl_setopt 實現文件下載進度回調
*/</span>

</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<h2>使用 PHP cURL 實現文件下載並顯示進度回調</h2>"</span></span><span>;

</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<p>在 PHP 中，我們可以通過 <code>curl_init