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Arithmetic Operators - PHP

What can you do without operators? Not much, if you're trying to do without them in a programming language, and PHP is no exception. On Monday, we barely had time to show you a long list of the operators in PHP. Today, we're going to show you what they do.

  1. PHP Operators
  2. Assignment Operators
  3. Arithmetic Operators
  4. Incremental Operators
  5. Better by Comparison
  6. Logical Operators
By: James Payne
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October 31, 2007

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You have been using most of the arithmetic operators since childhood. That and your fingers and toes. But don't worry; PHP is smarter than you. It's prettier than you. And according to some of the other programming languages, it really gets around. ASP is really jealous, but don't tell it I said so.

Let's look at some examples.




$add = 1 + 0;

$subtract = 2 - 1;

$multiply = 1 * 1;

$division = 2 / 2;

$modulus = 5 % 2;

echo $add;

echo $subtract;

echo $multiply;

echo $division;

echo $modulus;




The above code would print out all the values of our variables:






A Brief Note About My Dear Friend...The Modulus

The majority of the tutorials I've read on PHP never really explained Modulus in simple terms and so I never knew what it did. Maybe I'm just an idiot. But if there are other idiots out there, then you are in luck, because I am going to put this in very simple terms. Modulus gives you the remainder in division. Period. If I divide 2 / 2, there is no remainder. If I divide 3 /7 there is a remainder of 1. Modulus would return that 1.

>>> More PHP Articles          >>> More By James Payne

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