Add up numbers in PHP?

Adding up numbers is an important part of programming applications.

1. Create two variables

For example, we created $first_number and $second_number

As of right now, our variables have absolutely no value associated to them. If you run your code as is, you will have a neat “Server Error” page:

So in order to produce a result, we need to assign a value to each variable. It can obviously be whatever you want it to be.

2. Assign a value to a variable

For this example, let’s make the value of the $first_number variable to be equal to 2, and the $second_number variable to be equal to 5. In order to do that in your code, you need to assign a value to each variable. You do that by simply adding the following right after your variable  = “{value}”; and replace the {value} with whatever you want the value to be. It could be a string, or an integer.

In the case strictly of integer, you can attach a value either with or without the quotes surrounding it (“value” or value both work)

Without quotes surrounding {value}:

Or with quotes “{value}”:

Test it yourself. Both version work.

3. Create a $sum variable

Simply add $sum after

But just like before, since $sum is not set, if you try to run that code, you will get a server error.

We want to add up $first_number variable which is equal to 2, and the $second_number which is equal to 5 and we want that sum value to be carried in our $sum variable which should be equal to 7. 

To do that, we just write $sum = $first_number + $second_number

4. Display the $sum variable value

Now the last step is to display the value that the variable $sum hold using the echo function.

This is the output:

5. Done