Arithmetic operators in PHP basically function the same as mathematical operations in PHP code such as addition, subtraction, multiplication, division, etc.
3 + 3 is equal to 6
84 - 33 is equal to 51
45 / 5 is equal to 9
45 * 5 is equal to 225
If we assign the value 5 to the increment variable, then increment
it twice, it now equals 7