protected function op_add($left, $right)
{
if ($strLeft = $this->coerceString($left)) {
if ($right[0] == "string") {
$right[1] = "";
}
$strLeft[2][] = $right;
return $strLeft;
}
if ($strRight = $this->coerceString($right)) {
if ($left[0] == "string") {
$left[1] = "";
}
array_unshift($strRight[2], $left);
return $strRight;
}
}