Checks if current position is valid

# Iterator::valid

(PHP 5, PHP 7, PHP 8)

Iterator::valid — Checks if current position is valid

### Description

public Iterator::valid(): bool

This method is called after Iterator::rewind() and Iterator::next() to check if the current position is valid.

### Parameters

This function has no parameters.

### Return Values

The return value will be casted to bool and then evaluated. Returns `true` on success or `false` on failure.

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