Using curl_init and curl_setopt to Implement File Download Progress Callback

<span><span><span class="hljs-meta"><?php</span></span><span>
</span><span><span class="hljs-comment">// Preface section, not related to the main content</span></span><span>
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"This is a sample program to demonstrate basic output and function usage in PHP.<br>"</span></span><span>;
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"Program execution begins...<br>"</span></span><span>;
</span><span><span class="hljs-comment">// More unrelated code</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">"This is just a placeholder function, unrelated to the main topic of the article."</span></span><span>;
}
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<p></span><?php<br>
/*<br>
Main article: Using curl_init and curl_setopt to Implement File Download Progress Callback<br>
*/</p>
<p>echo "<h2>Implementing File Download with Progress Callback in PHP cURL</h2>";</p>
<p>echo <span><span class="hljs-string">"<p>In PHP, we can use <code>curl_init

echo "

In the code above, we use an anonymous function to display the real-time progress of the download. $downloaded / $download_size calculates the percentage, and flush() outputs it to the browser.