PHP reads directory tree

There was such a question in the written test of the interview with XX company a while ago:

Use PHP to list the directory tree!

I was stunned when I saw it! The basic idea is still there, but it uses a recursive algorithm, but I don’t know much about the method of operating directory files in PHP, so I’ll take a good refresher course today!
Problem-solving ideas:

1. List the files in the directory.
2. Determine whether it is a directory. If it is a directory, continue recursing.
3. Save all file names into a multi-dimensional array

<code><span><?php </span><span><span>function</span><span>recurDir</span><span>(<span>$pathName</span>)</span>
{</span><span>//将结果保存在result变量中</span><span>$result</span> = <span>array</span>();
    <span>$temp</span> = <span>array</span>();
    <span>//判断传入的变量是否是目录</span><span>if</span>(!is_dir(<span>$pathName</span>) || !is_readable(<span>$pathName</span>)) {
        <span>return</span><span>null</span>;
    }
    <span>//取出目录中的文件和子目录名,使用scandir函数</span><span>$allFiles</span> = scandir(<span>$pathName</span>);
    <span>//遍历他们</span><span>foreach</span>(<span>$allFiles</span><span>as</span><span>$fileName</span>) {
        <span>//判断是否是.和..因为这两个东西神马也不是。。。</span><span>if</span>(in_array(<span>$fileName</span>, <span>array</span>(<span>'.'</span>, <span>'..'</span>))) {
            <span>continue</span>;
        }
        <span>//路径加文件名</span><span>$fullName</span> = <span>$pathName</span>.<span>'/'</span>.<span>$fileName</span>;
        <span>//如果是目录的话就继续遍历这个目录</span><span>if</span>(is_dir(<span>$fullName</span>)) {
            <span>//将这个目录中的文件信息存入到数组中</span><span>$result</span>[<span>$fullName</span>] = recurDir(<span>$fullName</span>);
        }<span>else</span> {
            <span>//如果是文件就先存入临时变量</span><span>$temp</span>[] = <span>$fullName</span>;
        }
    }
    <span>//取出文件</span><span>if</span>(<span>$temp</span>) {
        <span>foreach</span>(<span>$temp</span><span>as</span><span>$f</span>) {
            <span>$result</span>[] = <span>$f</span>;
        }
    }
    <span>return</span><span>$result</span>;
}
<span>//验证一下这个函数是否好用！</span><span>$tree</span> = recurDir(<span>'cart_ajax'</span>);
<span>echo</span><span>"<pre class="brush:php;toolbar:false">"

; print_r($tree); echo""; ?>

cart_ajax folder structure

Contents under the js folder

Display results

Done ! The level of the directory is indeed like this, but it seems too low! Spruce it up a bit!

<code><span><span>function</span><span>beautifulTree</span><span>(<span>$arr</span>, <span>$l</span> = <span>'-|'</span>)</span>
{</span><span>static</span><span>$l</span> = <span>''</span>;
    <span>static</span><span>$str</span> = <span>''</span>;
    <span>//遍历刚才得到的目录树</span><span>foreach</span>(<span>$arr</span><span>as</span><span>$key</span>=><span>$val</span>) {
        <span>//如果是个数组，也就代表它是个目录，那么就在它的子文件中加入-|来表示是下一级吧</span><span>if</span>(is_array(<span>$arr</span>[<span>$key</span>])) {
            <span>$str</span>.=<span>$l</span>.<span>$key</span>.<span>"<br>"</span>;
            <span>$l</span>.=<span>'-|'</span>;
            beautifulTree(<span>$arr</span>[<span>$key</span>], <span>$l</span>);
        }<span>else</span> {
            <span>$str</span>.=<span>$l</span>.<span>$val</span>.<span>"<br>"</span>;
        }
    }
    <span>$l</span> = <span>''</span>;
    <span>return</span><span>$str</span>;
}

<span>$beautifulTree</span> = beautifulTree(<span>$tree</span>);
<span>echo</span><span>"<pre class="brush:php;toolbar:false">"

; print_r($beautiful); echo"";

Show results

').addClass('pre-numbering').hide(); $(this).addClass('has-numbering').parent().append($numbering); for (i = 1; i ').text(i)); }; $numbering.fadeIn(1700); }); });

The above introduces PHP to read the directory tree, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.