Question

php 二维数组怎么取到里边的值并且求和？

Array
(
[2] => Array
(
[id] => 2
[img] => upload/10.jpg
[name] => 1111
[num] => 4
[ptol] => 444
)

[1] => Array
(
[id] => 1
[img] => upload/10.jpg
[name] => 产品1
[num] => 2
[ptol] => 20
)

)
这是一个二维数组，如何把里边[ptol] 的值相加？

Answer 1

<?php
$arr = array(
array(
'id'=>2,
'img'=>'upload/10.jpg',
'name'=>'1111',
'num'=>4,
'ptol'=>444
),
array(
'id'=>1,
'img'=>'upload/10.jpg',
'name'=>'产品1',
'num'=>2,
'ptol'=>20
)
);

$sum = $arr[0]['ptol'] + $arr[1]['ptol'];
echo $sum;
// 输出 464
?>

如果还有更多...
$sum = 0;
for($i = 0; $i < count($arr); $i++) {
$sum += $arr[$i]['ptol'];
}
echo $sum;

Answer 2

可以php函数array_sum()，遍历的求和

$array = array(array(1,2),array(3,4));

$count = 0;
foreach($array as $key=>$value){

$count += array_sum($value);
}
echo $count;

Answer 3

foreach ($array as $k => $v)
{
$sum += $v['ptol'];
}

Answer 4

循环