$arr = $this->pages($paging);
$arr2 = $this->pages($arr['paging']);
$arr3 = $this->pages($arr2['paging']);
$arr4 = $this->pages($arr3['paging']);
и тд
function recursion($a)
{
if ($a < 20) {
echo "$a\n";
recursion($a + 1);
}
}