ADDITION IN PHP TUTORIAL 5

You don't have to use variable names to add up. You can do this:

print (10 + 20 + 30);

Or even this:

$number = 10;

print ($number + 30);

But the point is the same - use the plus symbol (+) to add up.

In the few next parts, you'll learn how to Subtract, Divide and Multiply.

similarly u can do for multiplication, addition,sub,division.