arsort

例

キー値で下降順に連想配列を並べ替えます。

 <span class="token php language-php"><span class="token delimiter important"><？php</span>
<span class="token variable">$ age</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 operator">=></span> <span class="token string double-quoted-string">"60"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"Steve"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"56"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"mark"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"31"</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span>
<span class="token function"></span></span><mark><span class="token function">Arsort</span> <span class="token punctuation">（</span> <span class="token variable">$ age</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