使用apcu_exists時常見哪些邏輯錯誤？如何避免這些問題？

<span><span><span class="hljs-meta"><?php</span></span><span>
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</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"這是程序啟動信息\n"</span></span><span>;
</span><span><span class="hljs-title function_ invoke__">date_default_timezone_set</span></span><span>(</span><span><span class="hljs-string">'Asia/Shanghai'</span></span><span>);
</span><span><span class="hljs-variable">$startTime</span></span><span> = </span><span><span class="hljs-title function_ invoke__">microtime</span></span><span>(</span><span><span class="hljs-literal">true</span></span><span>);
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</span><span><span class="hljs-comment">// 文章正文</span></span><span>
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</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<h1>使用apcu_exists時常見哪些邏輯錯誤？如何避免這些問題？</h1>"</span></span><span>;

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</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<p>APCu是PHP中用於內存緩存的擴展，它提供了緩存鍵值對的功能。其中，<code>apcu_exists()