sizeof

名稱:sizeof

分類:數組

所屬語言:php

一句話介紹:count() 的別名。

實例

例子1

返回數組中元素的數目：

 <span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$cars</span> <span class="token operator">=</span> <span class="token keyword">array</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"Volvo"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"BMW"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"Toyota"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token keyword"></span></span><mark><span class="token keyword">echo</span> <span class="token function">sizeof</span> <span class="token punctuation">(</span> <span class="token variable">$cars</span> <span class="token punctuation">)</span></mark><span class="token punctuation"></span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span>

親自試一試

例子2

遞歸地計算數組中元素的數目：

 <span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$cars</span> <span class="token operator">=</span> <span class="token keyword">array</span>
  <span class="token punctuation">(</span>
  <span class="token string double-quoted-string">"Volvo"</span> <span class="token operator">=></span> <span class="token keyword">array</span>
  <span class="token punctuation">(</span>
  <span class="token string double-quoted-string">"XC60"</span> <span class="token punctuation">,</span>
  <span class="token string double-quoted-string">"XC90"</span>
  <span class="token punctuation">)</span> <span class="token punctuation">,</span>
  <span class="token string double-quoted-string">"BMW"</span> <span class="token operator">=></span> <span class="token keyword">array</span>
  <span class="token punctuation">(</span>
  <span class="token string double-quoted-string">"X3"</span> <span class="token punctuation">,</span>
  <span class="token string double-quoted-string">"X5"</span>
  <span class="token punctuation">)</span> <span class="token punctuation">,</span>
  <span class="token string double-quoted-string">"Toyota"</span> <span class="token operator">=></span> <span class="token keyword">array</span>
  <span class="token punctuation">(</span>
  <span class="token string double-quoted-string">"Highlander"</span>
  <span class="token punctuation">)</span>
  <span class="token punctuation">)</span> <span class="token punctuation">;</span>

<span class="token keyword">echo</span> <span class="token string double-quoted-string">"常規計數："</span> <span class="token operator">.</span><span class="token function"></span></span><mark> <span class="token function">sizeof</span> <span class="token punctuation">(</span> <span class="token variable">$cars</span> <span class="token punctuation">)</span></mark><span class="token punctuation"></span> <span class="token operator">.</span> <span class="token string double-quoted-string">"<br>"</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"遞歸計數："</span> <span class="token operator">.</span><span class="token function"></span><mark> <span class="token function">sizeof</span> <span class="token punctuation">(</span> <span class="token variable">$cars</span> <span class="token punctuation">,</span> <span class="token number">1</span> <span class="token punctuation">)</span></mark><span class="token punctuation"></span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span>

親自試一試