$variable += 5
$variable = $variable + 5
public function toBinaryOperationEquivalent() { $binaryOperator = Assignment::toBinaryOperator($this->operator); if ($binaryOperator === null) { return $this; } return $this->update($this->assignTo, Assignment::EQUAL, Expression::binaryOperation($this->assignTo, $binaryOperator, $this->assignmentValue)); }