is_integer 和intval 配合使用時有哪些注意事項和最佳實踐？

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</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<h1>is_integer 和 intval 配合使用時有哪些注意事項和最佳實踐？</h1>"</span></span><span>;

</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<p>在 PHP 中，<code>is_integer