/** * Compares two values and returns whether they are equivalent. * * @see http://docs.mongodb.org/manual/reference/operator/aggregation/eq/ * @see Expr::eq * @param mixed|Expr $expression1 * @param mixed|Expr $expression2 * @return self */ public function eq($expression1, $expression2) { $this->expr->eq($expression1, $expression2); return $this; }