key

例

現在の内部ポインター位置から要素キー名を返します。

 <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">エコー</span><span class="token string double-quoted-string">「キーの現在の位置は：」です</span><span class="token operator">。</span><span class="token function"></span></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>

自分で試してみてください