php - 我的逻辑怎么了？

Question

我把这个简单的逻辑放在一起来添加两个数字，回显 a 和 b 的值然后显示答案，这里已经很晚了，但我不明白为什么答案不是 $a + $b 的总和。我以为这是 ABC 的东西，但一点帮助也不会错过。先感谢您。

$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

因为你有错别字...

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

应该：

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