[英]php sum variable in while loop
I have to "sum" variable's values in while, here us my example : 我必须“汇总”变量的值,而这里是我的例子:
while($row = mysql_fetch_array($result)){
$price= $row['price'] * $row['order_q'];
}
The code above will output if I put echo $price;
如果我把echo $price;
上面的代码将输出echo $price;
for example: 例如:
19 15 20 13 10 19 15 20 13 10
I want something like : sum($price)
or array_sum($price)
to count all the results of while loop. 我想要像: sum($price)
或array_sum($price)
来计算while循环的所有结果。 So, that i want to count: 19+15+20+13+10 = 77
所以,我想算一下: 19+15+20+13+10 = 77
How can I do it with php? 我怎么能用PHP做到这一点?
Thanks 谢谢
Simply initialize a variable outside your loop for example: 只需在循环外初始化变量,例如:
$total_price = 0;
and increment this number inside your loop: 并在循环中增加此数字:
$total_price += $row['price'] * $row['order_q'];
eg 例如
$total = 0;
while($row = mysql_fetch_array($result)){
$price= $row['price'] * $row['order_q'];
$total += $price;
}
echo 'total: ', $total;
Or - if all you want from the query is the total - you can do it "within" the sql query. 或者 - 如果你想从查询中得到的只是总数 - 你可以在sql查询中“执行”。
SELECT Sum(price*order_q) as total FROM ...
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