If Iterator::valid() returns false, the foreach() loop will be terminated.
(PHP 5, PHP 7, PHP 8)
Iterator::valid — Checks if current position is valid
This method is called after Iterator::rewind() and Iterator::next() to check if the current position is valid.
Esta função não possui parâmetros.
The return value will be casted to bool and then evaluated.
Retorna true em caso de sucesso ou false em caso de falha.
If Iterator::valid() returns false, the foreach() loop will be terminated.
If your class implements also ArrayAccess interface, you could use as valid() body
function valid(){
return $this->offsetExists($this->position);
}