array_intersect_key
キー名の比較を使用して配列の交差点を計算する
日本語
日本語
2つの配列のキー名を比較し、交差点を返します。
<span class="token php language-php"><span class="token delimiter important"><？php</span> <span class="token variable">$ a1</span> <span class="token operator">=</span> <span class="token keyword">array</span> <span class="token punctuation">（</span> <span class="token string double-quoted-string">"a"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"red"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"b"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"緑"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"c"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"blue"</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span> <span class="token variable">$ a2</span> <span class="token operator">=</span> <span class="token keyword">array</span> <span class="token punctuation">（</span> <span class="token string double-quoted-string">"a"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"red"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"c"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"blue"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"d"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"pink"</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span> <span class="token variable">$ result</span> <span class="token operator">=</span><span class="token function"></span></span><mark> <span class="token function">array_intersect_key</span> <span class="token punctuation">（</span> <span class="token variable">$ a1</span> <span class="token punctuation">、</span> <span class="token variable">$ a2</span> <span class="token punctuation">）</span></mark><span class="token punctuation"></span> <span class="token punctuation">;</span> <span class="token function">print_r</span> <span class="token punctuation">（</span> <span class="token variable">$ result</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span> <span class="token delimiter important">？></span>
2つのインデックス配列のキー名を比較し、交差点を返します。
<span class="token php language-php"><span class="token delimiter important"><？php</span> <span class="token variable">$ a1</span> <span class="token operator">=</span> <span class="token keyword">array</span> <span class="token punctuation">（</span> <span class="token string double-quoted-string">"red"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"green"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"blue"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"Yellow"</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span> <span class="token variable">$ a2</span> <span class="token operator">=</span> <span class="token keyword">array</span> <span class="token punctuation">（</span> <span class="token string double-quoted-string">"red"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"green"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"blue"</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span> <span class="token variable">$ result</span> <span class="token operator">=</span><span class="token function"></span></span><mark> <span class="token function">array_intersect_key</span> <span class="token punctuation">（</span> <span class="token variable">$ a1</span> <span class="token punctuation">、</span> <span class="token variable">$ a2</span> <span class="token punctuation">）</span></mark><span class="token punctuation"></span> <span class="token punctuation">;</span> <span class="token function">print_r</span> <span class="token punctuation">（</span> <span class="token variable">$ result</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span> <span class="token delimiter important">？></span>
3つの配列のキー名を比較し、交差点を返します。
<span class="token php language-php"><span class="token delimiter important"><？php</span> <span class="token variable">$ a1</span> <span class="token operator">=</span> <span class="token keyword">array</span> <span class="token punctuation">（</span> <span class="token string double-quoted-string">"a"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"red"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"b"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"緑"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"c"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"blue"</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span> <span class="token variable">$ a2</span> <span class="token operator">=</span> <span class="token keyword">array</span> <span class="token punctuation">（</span> <span class="token string double-quoted-string">"c"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"yellow"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"d"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"black"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"e"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"brown"</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span> <span class="token variable">$ a3</span> <span class="token operator">=</span> <span class="token keyword">array</span> <span class="token punctuation">（</span> <span class="token string double-quoted-string">"f"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"green"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"c"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"purple"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"g"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"red"</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span> <span class="token variable">$ result</span> <span class="token operator">=</span><span class="token function"></span></span><mark> <span class="token function">array_intersect_key</span> <span class="token punctuation">（</span> <span class="token variable">$ a1</span> <span class="token punctuation">、</span> <span class="token variable">$ a2</span> <span class="token punctuation">、</span> <span class="token variable">$ a3</span> <span class="token punctuation">）</span></mark><span class="token punctuation"></span> <span class="token punctuation">;</span> <span class="token function">print_r</span> <span class="token punctuation">（</span> <span class="token variable">$ result</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span> <span class="token delimiter important">？></span>
array_reduce
krsort
array_intersect_ukey
each
array_count_values
natsort
natcasesort
array_slice
