我的逻辑怎么了？ [关闭]

Question

I have put together this simple logic to add two numbers, echo the values for a and b then show the answer, it's pretty late here but i cant understand why the answer is NOT the sum of $a + $b. I thought this was ABC stuff but a little help would not go a miss. Thank you in advance.

$number_one = mt_rand(1,100);
$number_two = mt_rand(1,100);

function add_numbers($a, $b) 
{
$sum = $a + $b; 
return $sum;
}

echo "What is " . $number_two . " + " . $number_two . "? <br />";
$answer = add_numbers($number_one, $number_two);
echo $answer;

Answer 1

Because you have a typo...

echo "What is " . $number_two . " + " . $number_two . "? <br />";

Should be:

echo "What is " . $number_one . " + " . $number_two . "? <br />";
                          ^^^