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

Question

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;
?>

Steven Parker · Answer

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.

Amy Hsieh

Amy Hsieh

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

1 Answer

Steven Parker

Steven Parker