array_map
配列の各要素にコールバック関数を適用します
日本語
日本語
アレイ内の各値に関数を適用し、各値を単独で乗算し、新しい値を使用して配列を返します。
<span class="token php language-php"><span class="token delimiter important"><？php</span>
<span class="token keyword">機能</span><span class="token function-definition function">myfunction</span> <span class="token punctuation">（</span> <span class="token variable">$ v</span> <span class="token punctuation">）</span>
<span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token punctuation">（</span> <span class="token variable">$ v</span> <span class="token operator">*</span> <span class="token variable">$ v</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token variable">$</span> <span class="token punctuation">a</span> <span class="token operator">=</span> <span class="token keyword">array</span> <span class="token punctuation">（</span> <span class="token number">1、2、3、4、5</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span><span class="token number"></span><span class="token number"></span><span class="token number"></span><span class="token punctuation"></span><span class="token number"></span><span class="token punctuation"></span><span class="token punctuation"></span>
<span class="token function">print_r</span> <span class="token punctuation">（</span><span class="token function"></span></span><mark> <span class="token function">array_map</span> <span class="token punctuation">（</span> <span class="token string double-quoted-string">"myfunction"</span> <span class="token punctuation">、</span> <span class="token variable">$ a</span> <span class="token punctuation">）</span></mark><span class="token punctuation"></span> <span class="token punctuation">）</span> <span class="token punctuation">;</span>
<span class="token delimiter important">？></span>
ユーザー定義の関数を使用して、配列の値を変更します。
<span class="token php language-php"><span class="token delimiter important"><？php</span>
<span class="token keyword">機能</span><span class="token function-definition function">myfunction</span> <span class="token punctuation">（</span> <span class="token variable">$ v</span> <span class="token punctuation">）</span>
<span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">（</span> <span class="token variable">$ v</span> <span class="token operator">===</span> <span class="token string double-quoted-string">"dog"</span> <span class="token punctuation">）</span>
<span class="token punctuation">{</span>
<span class="token string double-quoted-string">「fido」</span><span class="token keyword">を返します</span><span class="token punctuation">。</span>
<span class="token punctuation">}</span>
<span class="token variable">$ v</span><span class="token keyword">を返します</span><span class="token punctuation">。</span>
<span class="token punctuation">}</span>
<span class="token variable">$ a</span> <span class="token operator">=</span> <span class="token keyword">array</span> <span class="token punctuation">（</span> <span class="token string double-quoted-string">"horse"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"dog"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"cat"</span> <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 function"></span></span><mark> <span class="token function">array_map</span> <span class="token punctuation">（</span> <span class="token string double-quoted-string">"myfunction"</span> <span class="token punctuation">、</span> <span class="token variable">$ a</span> <span class="token punctuation">）</span></mark><span class="token punctuation"></span> <span class="token punctuation">）</span> <span class="token punctuation">;</span>
<span class="token delimiter important">？></span>
2つの配列を使用します。
<span class="token php language-php"><span class="token delimiter important"><？php</span>
<span class="token keyword">機能</span><span class="token function-definition function">myfunction</span> <span class="token punctuation">（</span> <span class="token variable">$ v1</span> <span class="token punctuation">、</span> <span class="token variable">$ v2</span> <span class="token punctuation">）</span>
<span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">（</span> <span class="token variable">$ v1</span> <span class="token operator">===</span> <span class="token variable">$ v2</span> <span class="token punctuation">）</span>
<span class="token punctuation">{</span>
<span class="token string double-quoted-string">「同じ」</span><span class="token keyword">を返します</span><span class="token punctuation">。</span>
<span class="token punctuation">}</span>
<span class="token string double-quoted-string">「違う」</span><span class="token keyword">を返します</span><span class="token punctuation">。</span>
<span class="token punctuation">}</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">"horse"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"dog"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"cat"</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">"cow"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"dog"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"rat"</span> <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 function"></span></span><mark> <span class="token function">array_map</span> <span class="token punctuation">（</span> <span class="token string double-quoted-string">"myfunction"</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 punctuation">;</span>
<span class="token delimiter important">？></span>
アレイ内の値のすべての文字を大文字に変更します。
<span class="token php language-php"><span class="token delimiter important"><？php</span>
<span class="token keyword">機能</span><span class="token function-definition function">myfunction</span> <span class="token punctuation">（</span> <span class="token variable">$ v</span> <span class="token punctuation">）</span>
<span class="token punctuation">{</span>
<span class="token variable">$ v</span> <span class="token operator">=</span> <span class="token function">strtoupper</span> <span class="token punctuation">（</span> <span class="token variable">$ v</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span>
<span class="token variable">$ v</span><span class="token keyword">を返します</span><span class="token punctuation">。</span>
<span class="token punctuation">}</span>
<span class="token variable">$ a</span> <span class="token operator">=</span> <span class="token keyword">array</span> <span class="token punctuation">（</span> <span class="token string double-quoted-string">"animal"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"horse"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"type"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"哺乳類"</span> <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 function">array_map</span> <span class="token punctuation">（</span> <span class="token string double-quoted-string">"myfunction"</span> <span class="token punctuation">、</span> <span class="token variable">$ a</span> <span class="token punctuation">）</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span>
<span class="token delimiter important">？></span></span>
関数名をnullに割り当てるとき：
<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">"dog"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"cat"</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">"puppy"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"kitten"</span> <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 function"></span></span><mark> <span class="token function">array_map</span> <span class="token punctuation">（</span> <span class="token constant">null</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 punctuation">;</span> <span class="token delimiter important">？></span>
array
array_merge
array_udiff_uassoc
key
array_unshift
array_flip
array_reverse
array_pop
