array_reduce
コールバック関数を使用して、配列を単一の値に繰り返し単純化します
日本語
日本語
配列内の値をユーザー定義の関数に送信し、文字列を返します。
<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">$ 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 variable">$ v1</span><span class="token keyword">を返します</span><span class="token operator">。</span> <span class="token string double-quoted-string">" - "</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 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">"dog"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"cat"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"horse"</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_reduce</span> <span class="token punctuation">（</span> <span class="token variable">$ a</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"myfunction"</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>
初期パラメーターの設定：
<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 variable">$ v1</span><span class="token keyword">を返します</span><span class="token operator">。</span> <span class="token string double-quoted-string">" - "</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 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">"dog"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"cat"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"horse"</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_reduce</span> <span class="token punctuation">（</span> <span class="token variable">$ a</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"myfunction"</span> <span class="token punctuation">、</span> <span class="token number">5</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>
合計を返します：
<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">$ 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 variable">$ v1</span> <span class="token operator">+</span> <span class="token variable">$ v2</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">$</span> <span class="token punctuation">a</span> <span class="token operator">=</span> <span class="token keyword">array</span> <span class="token punctuation">（</span> <span class="token number">10、15、20</span> <span class="token punctuation">）</span> <span class="token number">;</span><span class="token punctuation"></span><span class="token number"></span><span class="token punctuation"></span>
<span class="token function">print_r</span> <span class="token punctuation">（</span><span class="token function"></span></span><mark> <span class="token function">array_reduce</span> <span class="token punctuation">（</span> <span class="token variable">$ a</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"myfunction"</span> <span class="token punctuation">、</span> <span class="token number">5</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>
extract
key_exists
array_diff_assoc
array_rand
array_uintersect_uassoc
array_change_key_case
array_key_last
reset
