Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

PHP Build a Simple PHP Application Working With Functions Introducing User-Defined Functions

Anna Takang Nchongarrey-Oben
Anna Takang Nchongarrey-Oben
7,365 Points

Write the code inside this mimic_array_sum() function. That code should add up all individual numbers in the array and r

I wonder why the code is not working? I think it is correct:

<?php function mimic_array_sum(){ $sum = 0; foreach($array as $number) { $sum = $sum + $number; } return $sum; }

$palindromic_primes = array(11, 757, 16361);


1 Answer

Sam Donald
Sam Donald
36,305 Points

You are close, but you didn't declare the function perimeter.

    function mimic_array_sum($array){ // Don't forget the perimeter.
        $sum = 0;
        foreach($array as $number) {
            $sum = $sum + $number;

        return $sum;

    $palindromic_primes = array(11, 757, 16361);