什么是我的逻辑？

Question

我把这个简单的逻辑放在一起添加两个数字，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。我认为这是ABC的东西，但有点帮助不会错过。提前谢谢。

$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

因为你有一个错字......

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

应该是：

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