PHP basic syntax arithmetic operations

Arithmetic operators are the vast majority of knowledge we have learned in elementary school:

##* Multiply sign, multiply by $x * $y / division sign, divided by $x / $y % Remainder is also called modulus and modulus $x % $y

Symbol	Explanation	Example
+	plus sign	#$x + $y
-	Minus sign	$x - $y

Similar to what we have learned in mathematics, there is also a priority: multiplication and division first, then addition and subtraction. If you want to change the priority more explicitly, use () [parentheses] to enclose the value you want to take precedence.