Codeigniter，获取数组的总值？

Question

我正在尝试获得数组的总值。

foreach ($query->result() as $row)
{
echo $row->amount;
};

而这正在回应普通数字，例如

224 2344 24 2342 123等...

现在我只想回应总价值。

Answer 1

使用$this->db->select_sum();

例如：

$this->db->select_sum('age');
$query = $this->db->get('members');
// Produces: SELECT SUM(age) as age FROM members

Answer 2

你可以把它加到一个变量（$total），因为你反正遍历所有元素。

$total = 0;
foreach ($query->result() as $row) {
    echo $row->amount;
    $total += $row->amount;
};
echo $total;