Valid

:::info[Note] This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information. :::

( excerpt from http://php.net/manual/en/iterator.valid.php )

public function valid(): bool;

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

Returns

• mixed - The return value will be casted to boolean and then evaluated. Returns TRUE on success or FALSE on failure.