Constructs a RecursiveDirectoryIterator

# RecursiveDirectoryIterator::__construct

(PHP 5 >= 5.1.2, PHP 7, PHP 8)

RecursiveDirectoryIterator::__construct — Constructs a RecursiveDirectoryIterator

### 说明

public function RecursiveDirectoryIterator::__construct(string `$directory`, int `$flags` = FilesystemIterator::KEY_AS_PATHNAME | FilesystemIterator::CURRENT_AS_FILEINFO)

Constructs a RecursiveDirectoryIterator() for the provided `directory`.

### 参数

`directory`

  The path of the directory to be iterated over.

`flags`

  Flags may be provided which will affect the behavior of some methods. A list of the flags can found under FilesystemIterator predefined constants. They can also be set later with FilesystemIterator::setFlags().

### 错误／异常

Throws an UnexpectedValueException if the `directory` does not exist.

Throws a ValueError if the `directory` is an empty string.

### 更新日志

版本 | 说明
--- | ---
8.0.0 | Now throws a ValueError if `directory` is an empty string; previously it threw a RuntimeException.

### 示例

示例 #1 RecursiveDirectoryIterator example

    <?php

    $directory = '/tmp';

    $it = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($directory));

    $it->rewind();
    while($it->valid()) {

        if (!$it->isDot()) {
            echo 'SubPathName: ' . $it->getSubPathName() . "\n";
            echo 'SubPath:     ' . $it->getSubPath() . "\n";
            echo 'Key:         ' . $it->key() . "\n\n";
        }

        $it->next();
    }

    ?>

以上示例的输出类似于：

    SubPathName: fruit/apple.xml
    SubPath:     fruit
    Key:         /tmp/fruit/apple.xml

    SubPathName: stuff.xml
    SubPath:
    Key:         /tmp/stuff.xml

    SubPathName: veggies/carrot.xml
    SubPath:     veggies
    Key:         /tmp/veggies/carrot.xml

### 参见

- FilesystemIterator::__construct() - Constructs a new filesystem iterator
- RecursiveIteratorIterator::__construct() - Construct a RecursiveIteratorIterator
- FilesystemIterator predefined constants

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