PHP的和变量在while循环 [英] php sum variable in while loop

问题描述

我必须在一段时间内求和"变量的值，这里是我的示例:

I have to "sum" variable's values in while, here us my example :

while($row = mysql_fetch_array($result)){
  $price= $row['price'] * $row['order_q'];
}

例如，如果我输入echo $price;，将输出以上代码:

The code above will output if I put echo $price; for example:

19 15 20 13 10

19 15 20 13 10

我想要类似:sum($price)或array_sum($price)来计数while循环的所有结果.所以，我想算一下:19+15+20+13+10 = 77

I want something like : sum($price) or array_sum($price) to count all the results of while loop. So, that i want to count: 19+15+20+13+10 = 77

我该如何使用php?

谢谢

推荐答案

只需在循环外初始化变量，例如:

Simply initialize a variable outside your loop for example:

$total_price = 0;

并在循环中递增此数字:

and increment this number inside your loop:

$total_price += $row['price'] * $row['order_q'];

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