private function equalRecurse(ClauseGroup $g1, ClauseGroup $g2, $level)
{
if ($g1->getType() != $g2->getType() || $g1->getCount() != $g2->getCount()) {
return false;
}
$subClauses1 = $g1->getSubclauses();
$subClauses2 = $g2->getSubclauses();
$ok = true;
for ($i = 0; $i < count($subClauses1); $i++) {
$item1 = $subClauses1[$i];
$item2 = $subClauses2[$i];
if ($item1 instanceof ClauseGroup) {
$ok = $this->equalRecurse($item1, $item2, $level + 1);
} else {
$ok = $item1 == $item2;
}
if (!$ok) {
break;
}
}
return $ok;
}
