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<?php
$appendIterator = new AppendIterator();

$data = array('a_elementOne','a_elementTwo','a_elementThree');
$appendIterator->append(new ArrayIterator($data));

$data = array('b_elementOne','b_elementTwo','b_elementThree');
$appendIterator->append(new ArrayIterator($data));

foreach($appendIterator as $item){
    echo $item, PHP_EOL;
}
//Output:
/*
a_elementOne
a_elementTwo
a_elementThree
b_elementOne
b_elementTwo
b_elementThree
*/