Check validity

# RecursiveTreeIterator::valid

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

RecursiveTreeIterator::valid — Check validity

### 说明

public function RecursiveTreeIterator::valid(): bool

Check whether the current position is valid.

警告

本函数还未编写文档，仅有参数列表。

### 参数

此函数没有参数。

### 返回值

`true` if the current position is valid, otherwise `false`

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