opendir

实例

打开一个目录，读取它的内容，然后关闭：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$dir</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"/images/"</span><span class="token punctuation">;</span>

<span class="token comment">// 打开目录，然后读取其内容</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">is_dir</span><span class="token punctuation">(</span><span class="token variable">$dir</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token variable">$dh</span> <span class="token operator">=</span> <span class="token function"></span><mark><span class="token function">opendir</span><span class="token punctuation">(</span><span class="token variable">$dir</span><span class="token punctuation">)</span></mark><span class="token punctuation"></span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token variable">$file</span> <span class="token operator">=</span> <span class="token function">readdir</span><span class="token punctuation">(</span><span class="token variable">$dh</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">!==</span> <span class="token constant boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
      <span class="token keyword">echo</span> <span class="token string double-quoted-string">"filename:"</span> <span class="token operator">.</span> <span class="token variable">$file</span> <span class="token operator">.</span> <span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    <span class="token function">closedir</span><span class="token punctuation">(</span><span class="token variable">$dh</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>

结果：

filename: cat.gif
filename: dog.gif
filename: horse.gif