key

名称:key

分类:数组

所属语言:php

一句话介绍:从关联数组中取得键名。

实例

从当前内部指针位置返回元素键名：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$people</span> <span class="token operator">=</span> <span class="token keyword">array</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"Bill"</span><span class="token punctuation">,</span> <span class="token string double-quoted-string">"Steve"</span><span class="token punctuation">,</span> <span class="token string double-quoted-string">"Mark"</span><span class="token punctuation">,</span> <span class="token string double-quoted-string">"David"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"键的当前位置是："</span> <span class="token operator">.</span> <span class="token function"></span><mark><span class="token function">key</span><span class="token punctuation">(</span><span class="token variable">$people</span><span class="token punctuation">)</span></mark><span class="token punctuation"></span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

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