count

实例

计算 <car> 元素的子节点数量：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$xml</span><span class="token operator">=</span><span class="token string heredoc-string"><span class="token delimiter symbol"><span class="token punctuation"><<<</span>XML</span>
  <cars>
    <car name="Volvo">
    <child/>
    <child/>
    <child/>
    <child/>
  </car>
  <car name="BMW">
    <child/>
    <child/>
  </car>
</cars>
<span class="token delimiter symbol">XML<span class="token punctuation">;</span></span></span>

<span class="token variable">$elem</span><span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">SimpleXMLElement</span><span class="token punctuation">(</span><span class="token variable">$xml</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">$elem</span> <span class="token keyword">as</span> <span class="token variable">$car</span><span class="token punctuation">)</span>
  <span class="token punctuation">{</span>
  <span class="token function">printf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%s has %d children.<br>"</span><span class="token punctuation">,</span> <span class="token variable">$car</span><span class="token punctuation">[</span><span class="token string single-quoted-string">'name'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token variable">$car</span><span class="token operator">-></span><span class="token function">count</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token delimiter important">?></span></span>

运行实例