可以让RecursiveDirectoryIterator跳过不可读目录吗？

问题描述

foreach（新的RecursiveIteratorIterator（新的RecursiveDirectoryIterator（。））为$ file）{
echo$ file\\\
;
}

有没有办法这个代码不会抛出UnexpectedValueException无法打开目录：允许被拒绝每当目录中有一个不可读的子目录，我试图列出？

更新

将 foreach（）转换为 while（）并显式调用 Iterator： try（）catch {} 没有帮助，包含在中的next（）这个代码：

  $ iter = new RecursiveIteratorIterator（new RecursiveDirectoryIterator（。））; 
 while（$ iter-> valid（））{
 $ file = $ iter-> current（）; 
 echo$ file\\\
; 
 try {
 $ iter-> next（）; 
} catch（UnexpectedValueException $ e）{
} 
}; 
  

如果有不可读子目录，则是无限循环。

解决方案

显然，您可以将 $ flags 参数传递给构造函数。只有，但它做你想要的：捕获getChildren（）调用中的异常，只需跳转到下一个元素。

更改您的类创建代码

  new RecursiveIteratorIterator（
 new RecursiveDirectoryIterator（。），
 RecursiveIteratorIterator： ：LEAVES_ONLY，
 RecursiveIteratorIterator :: CATCH_GET_CHILD）; 
  

它应该工作

foreach(new RecursiveIteratorIterator(new RecursiveDirectoryIterator(".")) as $file) {
  echo "$file\n";
}

Is there any way for this code to not throw UnexpectedValueException "failed to open dir: Permission denied" whenever there is a unreadable subdirectory inside directory I attempt to list?

UPDATE

Converting foreach() to while() and explicitly calling Iterator::next() wrapped in try() catch {} doesn't help. This code:

$iter = new RecursiveIteratorIterator(new RecursiveDirectoryIterator("."));
while($iter->valid()) {
    $file = $iter->current();
    echo "$file\n";
    try {
        $iter->next();
    } catch(UnexpectedValueException $e) {
    }
};

is an infinite loop if there is unreadable subdirectory.

解决方案

Apparently you can pass $flags parameter to constructor. There's only one flag in the docs, but it does exactly what you want: catches exceptions during getChildren() calls and simply jumps to the next element.

Change your class creation code to

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

and it should work

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