mysqli_result::$lengths 能提升查询性能吗？如何用它优化你的数据库操作

<span><span><span class="hljs-meta"><?php</span></span><span>
</span><span><span class="hljs-comment">// 这部分与文章内容无关，可以放一些示例PHP代码</span></span><span>
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"开始执行PHP脚本...\n"</span></span><span>;
</span><span><span class="hljs-variable">$example</span></span><span> = [</span><span><span class="hljs-string">'a'</span></span><span> => </span><span><span class="hljs-number">1</span></span><span>, </span><span><span class="hljs-string">'b'</span></span><span> => </span><span><span class="hljs-number">2</span></span><span>];
</span><span><span class="hljs-keyword">foreach</span></span><span> (</span><span><span class="hljs-variable">$example</span></span><span> </span><span><span class="hljs-keyword">as</span></span><span> </span><span><span class="hljs-variable">$key</span></span><span> => </span><span><span class="hljs-variable">$value</span></span><span>) {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<span class="hljs-subst">$key</span></span></span><span> => </span><span><span class="hljs-subst">$value</span></span><span>\n";
}
</span><span><span class="hljs-meta">?></span></span><span>

<hr>

</span><span><span class="hljs-meta"><?php</span></span><span>
</span><span><span class="hljs-comment">// 正文开始</span></span><span>
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<h1>mysqli_result::\$lengths 能提升查询性能吗？如何用它优化你的数据库操作</h1>"</span></span><span>;

</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<p>在PHP中，使用MySQLi扩展进行数据库操作时，开发者常常关注查询性能。<code>mysqli_result::\$lengths