php - 为什么我的数组会这样

Question

while($pp_info = mysqli_fetch_array($sqlpinfo)){

           $product_title = $pp_info['book_name'];
           $books_image = $pp_info['book_upload'];
           $books_price = array($pp_info['book_price']);
 }

 Array ( [0] => 324 ) 
 Array ( [0] => 500 ) 
 Array ( [0] => 543 ) 
 Array ( [0] => 22 )

如何获得每个数字的总和？

我使用array_sum($books_price);

结果是 324 500 543 22

Answer 1

您应该在 mysql 查询中使用 SUM(book_price) As Total。

SELECT SUM(column_name) FROM table_name;

检查这个link了解更多详情。

在PHP中，

$book_total = 0;  // define variable outside loop
while($pp_info = mysqli_fetch_assoc($sqlpinfo)){
  $product_title = $pp_info['book_name'];
  $books_image = $pp_info['book_upload'];
  $books_price = $pp_info['book_price'];  
  $book_total += $books_price; // perform addition operation
}
echo "Book Total: $book_total";

希望对你有帮助:)