Checks if the current element is valid

# IteratorIterator::valid

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

IteratorIterator::valid — Checks if the current element is valid

### 说明

public function IteratorIterator::valid(): bool

Checks whether the current element is valid.

### 参数

此函数没有参数。

### 返回值

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

### 参见

- iterator_count() - 计算迭代器中元素的个数
- IteratorIterator::current() - Get the current value

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