I cannot figure out how to add and subtract numbers in php.

Question

my code is the following:

<?php

//Place your code below this comment $integerOne = 1; $integerTwo = 2; ?>

the code challenge is "Add 5 to $integerOne and subtract 1 from $integerTwo."

index.php

<?php

//Place your code below this comment
$integerOne = 1;
$integerTwo = 2;
?>

Answer 1 · 2016-10-01T06:29:49Z

October 1, 2016 6:29am

Try this:

$integerOne = 1; $integerTwo = 2;

$integerOne += 5; $integerTwo -= 1;

The "+=" operator takes the value of the variable $integerOne and adds 5. It's equal to $intergerOne = $integerOne + 5;

Answer 2 · 2016-10-01T10:18:03Z

October 1, 2016 10:18am

Hey Madison!

TL;DR version:

For example, to add 5 to $integerOne and store the result in the same variable --

$integerOne = $integerOne + 5;

or, for shorter code

$integerOne += 5;

I know this kind of thing can feel tricky when you start. Good luck!

Welcome to the Treehouse Community