Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

PHP Build a Simple PHP Application Working With Functions Introducing Functions

<?php $numbers = array(1,5,8); echo "Sum is :" . array_sum($numbers); ?>

how is this not correct?


$numbers = array(1,5,8);

echo "Sum is :" . array_sum($numbers);


3 Answers

Your answer is right, but you need to store the outcome into a variable and echo the variable. Like this.


$numbers = array(1,5,8);

$sum = array_sum($numbers);

echo $sum;


so it need to be a variable...tnx

Cristian Altin
Cristian Altin
12,165 Points

It works fine the way you wrote it, here's the code in the PHP command line interface:

php > $num = array(1,5,8);
php > echo "Sum is :" . array_sum($num);
Sum is :14

I guess you needed to add a variable because of some requirements by the exercise or workings behind the scenes of the answer checker.