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您好，我如何从数据库中获取值并将它们放入变量中，以便我可以在数学运算符中使用它们，因为现在当我尝试这样做时显示空白。当我写 echo $row['sugeneruoja']; 它时，它显示了值，但是当我尝试像 $Investment = $Investment+1+$MonInvestment*12))*1+$row["sugeneruoja"]*$Interest); 它不工作一样进行数学运算时
echo $row['sugeneruoja'];
$Investment = $Investment+1+$MonInvestment*12))*1+$row["sugeneruoja"]*$Interest);