Check whether the current element is valid

# FilterIterator::valid

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

FilterIterator::valid — Check whether the current element is valid

### 说明

public function FilterIterator::valid(): bool

Checks whether the current element is valid.

> 注意:

> The standard implementation of this function will initially return `false` until the inner iterator is advanced to the first accepted element.

### 参数

此函数没有参数。

### 返回值

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

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