AppendIterator::key Gets the current key &reftitle.description; public scalarAppendIterator::key Get the current key. &reftitle.parameters; &no.function.parameters; &reftitle.returnvalues; The current key if it is valid or &null; otherwise. &reftitle.examples; 'aardwolf', 'b' => 'bear', 'c' => 'capybara')); $array_b = new ArrayIterator(array('apple', 'orange', 'lemon')); $iterator = new AppendIterator; $iterator->append($array_a); $iterator->append($array_b); // Manual iteration $iterator->rewind(); while ($iterator->valid()) { echo $iterator->key() . ' ' . $iterator->current() . PHP_EOL; $iterator->next(); } echo PHP_EOL; // With foreach foreach ($iterator as $key => $current) { echo $key . ' ' . $current . PHP_EOL; } ?> ]]> &example.outputs; &reftitle.seealso; Iterator::key AppendIterator::current AppendIterator::valid AppendIterator::next AppendIterator::rewind