如何使用RecursiveIteratorIterator忽略目录？ [英] How to ignore directories using RecursiveIteratorIterator?

问题描述

我已经尝试了几种方法来在文件系统上使用 RecursiveIteratorIterator 忽略某些目录。

I have tried several methods to ignore certain directories using RecursiveIteratorIterator on a file system.

为了这个缘故例如，我想忽略以下目录： / cache 。

For the sake of an example say I want to ignore the following directory: /cache.

我的 Iterator 看起来像这样：

//$dirname is root
$directory = new RecursiveDirectoryIterator($dirname);
$mega = new RecursiveIteratorIterator($directory, RecursiveIteratorIterator::SELF_FIRST);

foreach ($mega as $fileinfo) {
 echo $fileinfo;
}

我已经能够使用忽略某些文件扩展名pathinfo 例如，这可行：

I have been able to ignore certain file extensions using pathinfo for example this works:

$filetypes = array("jpg", "png");
$filetype = pathinfo($fileinfo, PATHINFO_EXTENSION);

foreach ($mega as $fileinfo) {
    if (!in_array(strtolower($filetype), $filetypes)) {
    echo $fileinfo;
    }
}

当我尝试使用 PATHINFO_DIRNAME （使用数组中相应的目录路径）它不起作用，没有错误，它只是不会忽略目录。

When I try it using PATHINFO_DIRNAME (with the appropriate directory paths in the array) it does not work, there are no errors, it just does not ignore the directories.

我还尝试使用 FilterIterator 无效，现在我想也许我应该使用 RegexIterator 。

I have also experimented with using FilterIterator to no avail, and now I'm thinking maybe I should use RegexIterator.

使用 RecursiveIteratorIterator 忽略目录的最简单，最有效的方法是什么？

What would be the simplest and most efficient way to ignore directories using RecursiveIteratorIterator ?

无效的实验。
使用 PATHINFO_DIRNAME

$dirignore = array("cache", "cache2");
$directory = new RecursiveDirectoryIterator($dirname);
$mega = new RecursiveIteratorIterator($directory, RecursiveIteratorIterator::SELF_FIRST);
$dirtype = pathinfo($fileinfo, PATHINFO_DIRNAME); 

if (!in_array($dirtype), $dirignore)) {
echo $fileinfo;  //no worky still echo directories
}

使用 FilterIterator （不知道这是如何工作的）

Using FilterIterator (not sure how this works)

class DirFilter extends FilterIterator
{
    public function accept()
    {
        //return parent::current() != "..\cache\";

       $file = $this->getInnerIterator()->current();
       if ($file != "..\cache")
       return $file->getFilename();

      //also tried with same error as below
      //return !preg_match('/\cache', $file->getFilename());
    }
}

$directory= new RecursiveDirectoryIterator($dirname);
$directory = new DirFilter($directory); 
$mega = new RecursiveIteratorIterator($directory, RecursiveIteratorIterator::SELF_FIRST);
// loop

结果为错误：一个实例需要RecursiveIterator或IteratorAggregate创建它

推荐答案

您的 DirFilter 想扩展 RecursiveFilterIterator ，因为它与递归迭代器一起使用。不这样做是造成错误的原因。

Your DirFilter wants to extend RecursiveFilterIterator, since it is being used with a recursive iterator. Not doing that, is the cause of your error.

class DirFilter extends RecursiveFilterIterator
{
    // …
}

下一步是弄清楚如何使用正确地接受（）。它应该返回 true 或 false 值，该值指示是否应包含当前项目（<$ c迭代中$ c> true ）或排除（ false ）。从 accept（）返回文件名不是您想要做的。

The next step is figuring out how to use accept() properly. It is supposed to return a true or false value, which dictates whether the current item should be included (true) or excluded (false) from the iteration. Returning a file name from accept() is not what you want to be doing.

class DirFilter extends RecursiveFilterIterator
{
    public function accept()
    {
        $excludes = array("cache", "cache2");
        return !($this->isDir() && in_array($this->getFilename(), $excludes));
    }
}

---

能够传入排除目录数组可能会很好。这需要更多的代码，但更可重用。

---

It might be nice to be able to pass in the array of excluded directories. This requires a little more code but is much more reusable.

class DirFilter extends RecursiveFilterIterator
{
    protected $exclude;
    public function __construct($iterator, array $exclude)
    {
        parent::__construct($iterator);
        $this->exclude = $exclude;
    }
    public function accept()
    {
        return !($this->isDir() && in_array($this->getFilename(), $this->exclude));
    }
    public function getChildren()
    {
        return new DirFilter($this->getInnerIterator()->getChildren(), $this->exclude);
    }
}

此代码可以像：

$directory = new RecursiveDirectoryIterator($dirname);
$filtered = new DirFilter($directory, $dirignore); 
$mega = new RecursiveIteratorIterator($filtered, …);

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