php - 无法使用 RecursiveDirectoryIterator 跳过不可读的目录

Question

我想获取所有子目录的列表并且我的以下代码有效，除非我对某些文件夹具有只读权限。

在下面的问题中，它显示了如何使用 RecursiveDirectoryIterator 跳过目录 Can I make RecursiveDirectoryIterator skip unreadable directories?但是我的代码在这里略有不同，我无法解决这个问题。

$path = 'www/';
foreach (new RecursiveIteratorIterator(
       new RecursiveDirectoryIterator($path,RecursiveDirectoryIterator::KEY_AS_PATHNAME),
            RecursiveIteratorIterator::CHILD_FIRST) as $file => $info) 
            {
                if ($info->isDir())
                {
                       echo $file . '<br>';                     
                }
            }   

我得到了错误

Uncaught exception 'UnexpectedValueException' with message 'RecursiveDirectoryIterator::__construct(../../www/special): failed to open dir: Permission denied'

我已经尝试用其他问题中接受的答案替换它。

new RecursiveIteratorIterator(
new RecursiveDirectoryIterator("."), 
RecursiveIteratorIterator::LEAVES_ONLY,
RecursiveIteratorIterator::CATCH_GET_CHILD);

但是这段代码不会像我想要的那样给我一个 www 内所有目录的列表，我哪里出错了？

Answer 1

简介

您的代码的主要问题是使用 CHILD_FIRST

FROM PHP DOC

Optional mode. Possible values are

• RecursiveIteratorIterator::LEAVES_ONLY - The default. Lists only leaves in iteration.
• RecursiveIteratorIterator::SELF_FIRST - Lists leaves and parents in iteration with parents coming first.
• RecursiveIteratorIterator::CHILD_FIRST - Lists leaves and parents in iteration with leaves coming first.

您应该使用SELF_FIRST 以便包含当前目录。您还忘记添加可选参数 RecursiveIteratorIterator::CATCH_GET_CHILD

FROM PHP DOC

Optional flag. Possible values are RecursiveIteratorIterator::CATCH_GET_CHILD which will then ignore exceptions thrown in calls to RecursiveIteratorIterator::getChildren().

重温您的代码

foreach (new RecursiveIteratorIterator(
        new RecursiveDirectoryIterator($path,RecursiveDirectoryIterator::KEY_AS_PATHNAME),
        RecursiveIteratorIterator::SELF_FIRST, RecursiveIteratorIterator::CATCH_GET_CHILD) as $file => $info)
{
    if ($info->isDir())
    {
        echo $file . '<br>';
    }
}

你真的想要CHILD_FIRST

如果你真的想维护CHILD_FIRST结构那么我建议你使用ReadableDirectoryIterator

例子

foreach ( new RecursiveIteratorIterator(
        new ReadableDirectoryIterator($path),RecursiveIteratorIterator::CHILD_FIRST) as $file ) {
    echo $file . '<br>';
}

使用的类

class ReadableDirectoryIterator extends RecursiveFilterIterator {
    function __construct($path) {
        if (!$path instanceof RecursiveDirectoryIterator) {
            if (! is_readable($path) || ! is_dir($path))
                throw new InvalidArgumentException("$path is not a valid directory or not readable");
            $path = new RecursiveDirectoryIterator($path, RecursiveDirectoryIterator::SKIP_DOTS);
        }
        parent::__construct($path);
    }

    public function accept() {
        return $this->current()->isReadable() && $this->current()->isDir();
    }
}