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 Basic PHP Website (2018) Listing and Sorting Inventory Items Working with Functions

Amy Hsieh
Amy Hsieh
6,023 Points
Posted by Amy Hsieh
Amy Hsieh
6,023 Points

Read these codes, my answer is 10 but it's wrong. Can anyone point out my mistake?

What does the following code display?

$numbers = array(1,2,3,4); $total = count($numbers); $sum = 0; $output = ""; $loop = 0;

foreach($numbers as $number) { $loop = $loop + 1; if ($loop < $total) { $output = $number . $output; } }

echo $output;

?>

1 Answer

Steven Parker
Steven Parker
229,744 Points
Steven Parker
Steven Parker
229,744 Points

Sure, you were thinking that the numbers are being added, but "$output" is a string, and the period (".") is the string concatenation operator.

So that means the loop is creating a string by putting each digit in front of the others. Also notice that the loop count is incremented before the "if" is done, which will affect how many of the digits are handled.