count
計算數組中的單元數目，或對像中的屬性個數
中文(繁體)
中文(繁體)
計算<car> 元素的子節點數量：
<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>
array_udiff_assoc
extract
array_reverse
array_product
array_flip
current
key_exists
array_key_first
