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array_slice

配列からセグメントを取ります
名前:array_slice
カテゴリ:配列
対応言語:php
一言説明:アレイの選択した部分を返します。

例1

配列の3番目の要素から始まり、配列内の残りの要素を返します。

 <span class="token php language-php"><span class="token delimiter important"><?php</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">"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 string double-quoted-string">"Brown"</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_slice</span> <span class="token punctuation">(</span> <span class="token variable">$ a</span> <span class="token punctuation">、</span> <span class="token number">2</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>

自分で試してみてください

例2

配列の2番目の要素からそれを取り、2つの要素のみを返します。

 <span class="token php language-php"><span class="token delimiter important"><?php</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">"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 string double-quoted-string">"Brown"</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_slice</span> <span class="token punctuation">(</span> <span class="token variable">$</span> <span class="token punctuation">a</span> <span class="token punctuation">、</span> <span class="token number">1、2</span> <span class="token number">)</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>

自分で試してみてください

例3

ネガティブスタートパラメーターを使用します:

 <span class="token php language-php"><span class="token delimiter important"><?php</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">"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 string double-quoted-string">"Brown"</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_slice</span> <span class="token punctuation">(</span> <span class="token variable">$</span> <span class="token punctuation">a</span> <span class="token punctuation">、</span> <span class="token operator">-2、1</span> <span class="token number">)</span><span class="token number">​</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>

自分で試してみてください

例4

Preserveパラメーターをtrueに設定します。

 <span class="token php language-php"><span class="token delimiter important"><?php</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">"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 string double-quoted-string">"Brown"</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_slice</span> <span class="token punctuation">(</span> <span class="token variable">$</span> <span class="token constant boolean">a</span> <span class="token punctuation">、</span> <span class="token number">1、2</span> <span class="token punctuation">、</span> <span class="token number">true</span> <span class="token punctuation">)</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>

自分で試してみてください

例5

文字列キー名と整数キー名を処理します。

 <span class="token php language-php"><span class="token delimiter important"><?php</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">"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">"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">"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">"yellow"</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 function">print_r</span> <span class="token punctuation">(</span> <span class="token function">array_slice</span> <span class="token punctuation">(</span> <span class="token variable">$</span> <span class="token punctuation">a</span> <span class="token punctuation">、</span> <span class="token number">1、2</span> <span class="token punctuation">)</span> <span class="token punctuation">)</span> <span class="token number">;</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">"0"</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">"1"</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">"2"</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">"3"</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">"4"</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 function">print_r</span> <span class="token punctuation">(</span><span class="token function"></span></span><mark> <span class="token function">array_slice</span> <span class="token punctuation">(</span> <span class="token variable">$</span> <span class="token punctuation">a</span> <span class="token punctuation">、</span> <span class="token number">1、2</span> <span class="token number">)</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>

自分で試してみてください

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