Question

How can increase a number according to percent with PHP?

For example: 100 + 20% = 120 or 1367 + 33% = 1818.11

If output was this: 1818.11 i want only this: 1818 or this 12.32 = 12 or 546.98 = 546

How is it?

Answer 1

I’m not sure if you’re looking for something deeper, but the answer seems fairly straightforward…

$increasedValue = floor( $value * ( 1 + ( $percentageIncrease / 100 ) ) );

If you wrapped that in a function, say increaseByPercentage( $value, $percentageIncrease ), you would get…

increaseByPercentage( 100, 20 ); //returns 120
increaseByPercentage( 1367, 33 ); //returns 1818

Edit
Based on your comment, I’m not sure what else you are looking for. PHP has 6 arithmetic operators:

• Negation (-$a)
  -5 = -5

• Addition ($a + $b)
  5 + 3 = 8

• Subtraction ($a – $b)
  5 – 3 = 2

• Multiplication ($a * $b)
  5 * 3 = 15

• Division ($a / $b)
  5 / 3 = 1.667

• Modulus ($a % $b)
  5 % 3 = 2

If you write a line of code that says $a = 100 + 20%; it will not parse.