<?php

$array = array(
	'teste' => '1',
	'teste2' => '2'
);
while (list($key, $value) = each($array)) {
	echo $key . "\n";
}
echo "------------\n";

$array = array(
	'teste' => '1',
	'teste2' => '2'
);
while ($value = current($array)) {
	echo key($array) . "\n";
	next($array);
}