PHP Manual: Create a filtered iterator from another iterator

public CallbackFilterIterator::__construct ( Iterator $iterator , callable $callback )

Creates a filtered iterator using the callback to determine which items are accepted or rejected.

iterator

The iterator to be filtered.

callback

The callback, which should return TRUE to accept the current item or FALSE otherwise. See Examples.

May be any valid callable value.

No value is returned.

CallbackFilterIterator::__construct