joshdifabio is technically correct, but I don't see this as a bug. You can't rewind a generator and thats what append iterator does.

If you want to use AppendIterator with Generators just wrap them with NoRewindIterator:

<?php
function foo() {
        foreach ([] as $foo) {
                yield $foo;
        }
}
$append = new AppendIterator();
$append->append(new NoRewindIterator(foo()));

var_dump(iterator_to_array($append));

https://3v4l.org/pgiXB

Note that AppendIterator will segfault when iterating over an empty generator. Do not use AppendIterator in conjunction with generators.

https://3v4l.org/YC68k

https://bugs.php.net/bug.php?id=71436

In many cases, especially for streaming sources, Generators are way more efficient. I noticed that the AppendIterator buffers the entire "inner iterator".

<?php
/**
 * This appends $next iterator to $iterator.
 */
function append_iterators(...$iterators){
    foreach($iterators as $iterator)
        foreach($iterator as $row)
            yield($row);
}

/**
 * Merge iterator takes one first from each iterator until
 * every iterator is empty.
 */
function merge_iterators(....$its) {
    $numberOfIts = sizeof($its);
    while($numberOfIts > 0) {
        $iterator = array_shift($its);
        yield($iterator->current());
        $iterator->next();
        if($iterator->valid())
            $its[] = $iterator;
        else
            $numberOfIts--;
    }
});
?>