RecursiveDirectoryIterator 在“打开的文件太多”上抛出 UnexpectedValueException答案

【问题标题】：RecursiveDirectoryIterator throws UnexpectedValueException on "Too many open files"RecursiveDirectoryIterator 在“打开的文件太多”上抛出 UnexpectedValueException
【发布时间】：2011-11-01 12:02:00
【问题描述】：

以下代码：

$zip = new ZipArchive();

if ($zip->open('./archive.zip', ZIPARCHIVE::CREATE) !== TRUE) {
    die ("Could not open archive");
}

$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator("./folder/"));

foreach ($iterator as $key => $value) {
  try {
    $zip->addFile(realpath($key), $key);
    echo "'$key' successfully added.\n";
  } catch (Exception $e) {
    echo "ERROR: Could not add the file '$key': $e\n";
  }
}

$zip->close();

如果您尝试迭代的子文件夹中有太多文件，则会引发以下异常：

Uncaught exception 'UnexpectedValueException' with message 'RecursiveDirectoryIterator::__construct(./some/path/): failed to open dir: Too many open files' in /some/other/path/zip.php:24
Stack trace:
#0 [internal function]: RecursiveDirectoryIterator->__construct('./some/path/')
#1 /some/other/path/zip.php(24): RecursiveDirectoryIterator->getChildren()
#2 {main}
thrown in /some/other/path/zip.php on line 24

如何在不遇到此异常的情况下成功迭代大量文件夹和文件？

【问题讨论】：

标签： php iterator iteration

【解决方案1】：

只需使用 iterator_to_array 函数将迭代器转换为数组，您就可以遍历任意数量的文件：

$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator("./folder/"));
$files = iterator_to_array($iterator, true);

// iterate over the directory
// add each file found to the archive
foreach ($files as $key => $value) {
  try {
    $zip->addFile(realpath($key), $key);
    echo "'$key' successfully added.\n";
  } catch (Exception $e) {
    echo "ERROR: Could not add the file '$key': $e\n";
  }
}

【讨论】：