结合 chdir()、opendir() 和 readdir() 实现目录遍历的实战示例

gitbox 2025-09-09
<span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-comment">// 这部分代码与文章内容无关，只是做个示例</span></span><span>
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"PHP 目录遍历示例开始&lt;br&gt;"</span></span><span>;
</span><span><span class="hljs-meta">?&gt;</span></span><span>

&lt;hr&gt;

</span><span><span class="hljs-meta">&lt;?php</span></span><span>
<span class="hljs-comment">/**
 * 结合 chdir()、opendir() 和 readdir() 实现目录遍历的实战示例
 *
 * 在 PHP 中，操作文件和目录是常见需求，尤其是需要遍历目录时。
 * chdir() 可以改变当前工作目录，opendir() 用于打开目录句柄，
 * readdir() 用于逐个读取目录中的文件或子目录。
 *
 * 本文将通过一个示例，演示如何结合这三个函数实现目录的遍历。
 */</span>

</span><span><span class="hljs-function"><span class="hljs-keyword">function</span></span></span><span> </span><span><span class="hljs-title">traverseDir</span></span><span>(</span><span><span class="hljs-params"><span class="hljs-variable">$path</span></span></span><span>) {
    </span><span><span class="hljs-comment">// 先尝试改变工作目录</span></span><span>
    </span><span><span class="hljs-keyword">if</span></span><span> (!</span><span><span class="hljs-title function_ invoke__">chdir</span></span><span>(</span><span><span class="hljs-variable">$path</span></span><span>)) {
        </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"无法切换到目录：<span class="hljs-subst">$path</span></span></span><span>&lt;br&gt;";
        </span><span><span class="hljs-keyword">return</span></span><span>;
    }
    
    </span><span><span class="hljs-comment">// 打开当前目录</span></span><span>
    </span><span><span class="hljs-variable">$handle</span></span><span> = </span><span><span class="hljs-title function_ invoke__">opendir</span></span><span>(</span><span><span class="hljs-string">'.'</span></span><span>);
    </span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-variable">$handle</span></span><span> === </span><span><span class="hljs-literal">false</span></span><span>) {
        </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"无法打开目录句柄&lt;br&gt;"</span></span><span>;
        </span><span><span class="hljs-keyword">return</span></span><span>;
    }
    
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"当前目录： "</span></span><span> . </span><span><span class="hljs-title function_ invoke__">getcwd</span></span><span>() . </span><span><span class="hljs-string">"&lt;br&gt;"</span></span><span>;
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"目录内容如下：&lt;br&gt;"</span></span><span>;
    
    </span><span><span class="hljs-comment">// 遍历目录中的文件和文件夹</span></span><span>
    </span><span><span class="hljs-keyword">while</span></span><span> ((</span><span><span class="hljs-variable">$entry</span></span><span> = </span><span><span class="hljs-title function_ invoke__">readdir</span></span><span>(</span><span><span class="hljs-variable">$handle</span></span><span>)) !== </span><span><span class="hljs-literal">false</span></span><span>) {
        </span><span><span class="hljs-comment">// 忽略特殊目录 . 和 ..</span></span><span>
        </span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-variable">$entry</span></span><span> === </span><span><span class="hljs-string">'.'</span></span><span> || </span><span><span class="hljs-variable">$entry</span></span><span> === </span><span><span class="hljs-string">'..'</span></span><span>) {
            </span><span><span class="hljs-keyword">continue</span></span><span>;
        }
        
        </span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-title function_ invoke__">is_dir</span></span><span>(</span><span><span class="hljs-variable">$entry</span></span><span>)) {
            </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"[目录] <span class="hljs-subst">$entry</span></span></span><span>&lt;br&gt;";
        } </span><span><span class="hljs-keyword">else</span></span><span> {
            </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"[文件] <span class="hljs-subst">$entry</span></span></span><span>&lt;br&gt;";
        }
    }
    
    </span><span><span class="hljs-title function_ invoke__">closedir</span></span><span>(</span><span><span class="hljs-variable">$handle</span></span><span>);
}

</span><span><span class="hljs-comment">// 示例调用：假设有一个 test_dir 目录</span></span><span>
</span><span><span class="hljs-variable">$testPath</span></span><span> = </span><span><span class="hljs-string">'test_dir'</span></span><span>;
</span><span><span class="hljs-title function_ invoke__">traverseDir</span></span><span>(</span><span><span class="hljs-variable">$testPath</span></span><span>);
</span></span>
chdir