count_chars

例

例1

「Hello World！」で使用されているすべての異なる文字を含む文字列を返します。 （モード3）：

 <span class="token php language-php"><span class="token delimiter important"><？php</span>
<span class="token variable">$ str</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"hello world！"</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token function">count_chars</span> <span class="token punctuation">（</span> <span class="token variable">$ str</span> <span class="token punctuation">、</span> <span class="token number">3</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span>
<span class="token delimiter important">？></span></span>

自分で試してみてください

例2

「Hello World！」で使用されていないすべての文字を含む文字列を返します。 （スキーマ4）：

 <span class="token php language-php"><span class="token delimiter important"><？php</span>
<span class="token variable">$ str</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"hello world！"</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token function">count_chars</span> <span class="token punctuation">（</span> <span class="token variable">$ str</span> <span class="token punctuation">、</span> <span class="token number">4</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span>
<span class="token delimiter important">？></span></span>

自分で試してみてください

例3

この例では、count_chars（）を使用して文字列をチェックします。リターンモードが1に設定されています。モード1は、キー名としてASCII値を持つ配列を返し、発生数はキー値です。

 <span class="token php language-php"><span class="token delimiter important"><？php</span>
<span class="token variable">$ str</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"hello world！"</span> <span class="token punctuation">;</span>
<span class="token function">print_r</span> <span class="token punctuation">（</span> <span class="token function">count_chars</span> <span class="token punctuation">（</span> <span class="token variable">$ str</span> <span class="token punctuation">、</span> <span class="token number">1</span> <span class="token punctuation">）</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span>
<span class="token delimiter important">？></span></span>

自分で試してみてください

例4

ASCII文字が文字列に表示される回数をカウントする別の例：

 <span class="token php language-php"><span class="token delimiter important"><？php</span>
<span class="token variable">$ str</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"phpはかなり楽しいです!!"</span> <span class="token punctuation">;</span>
<span class="token variable">$ strarray</span> <span class="token operator">=</span> <span class="token function">count_chars</span> <span class="token punctuation">（</span> <span class="token variable">$ str</span> <span class="token punctuation">、</span> <span class="token number">1</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span>

<span class="token keyword">foreach</span> <span class="token punctuation">（</span> <span class="token variable">$ strarray</span> <span class="token keyword">as</span> <span class="token variable">$ key</span> <span class="token operator">=></span> <span class="token variable">$ value</span> <span class="token punctuation">）</span>
  <span class="token punctuation">{</span>
<span class="token keyword">エコー</span><span class="token string double-quoted-string">「キャラクター<b> &#39;」</span> <span class="token operator">。</span> <span class="token function">chr</span> <span class="token punctuation">（</span> <span class="token variable">$ key</span> <span class="token punctuation">）</span> <span class="token operator">。</span> <span class="token string double-quoted-string">"</b>は<span class="token interpolation"><span class="token variable">$ value</span></span> times。<br>"</span> <span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token delimiter important">？></span></span>

自分で試してみてください