Integers. You mean math? The integer data type represents whole numbers, either positive or negative or zero, not fractions. Before we get into anything worth looking at, let’s look at a simple example. Create a new PHP file and copy the following code into it.   <?php $x = 0; $y = 1; $z = -2; echo $x + $y + $z; ?>   You should get a -1 as the result. I know that we haven’t looked at arithmetic operators, but I’m sure that you can figure out what the + operator does in the previous example. We set