PHP中的值之和

Question

我的代码:

$result2 = mysql_query("SELECT units,finalgrade FROM grades WHERE course='BSN' &&     semester='1-1' && studentnumber='$username'");
        while($row = mysql_fetch_array($result2))
  {

  $aw=array($row['units']*$row['finalgrade']);

  }

输出:5.25,6,6.75,6,5.25,6.75,4.5

我怎样才能得到这些数字的总和？

Answer 1

您可以使用此查询在SQL中完全执行此操作:

SELECT SUM(units * finalgrade) AS thesum FROM grades WHERE ....

将返回一行,您可以阅读结果$row['thesum'].