PHP-php计算二维数组中的值组成一个新的数组

Question

比如说我有一个二维数组

array(
   'phone' => array(
      'amount' => 100,
      'order'  => 10,
      'refund' => 10
    ),
   'amazon' => array(
      'amount' => 200,
      'order'  => 12,
      'refund' => 11
   )
)

Answer 1

 $a= array(
'phone' => array(
'amount' => 100,
'order' => 10,
'refund' => 10
),
'amazon' => array(
'amount' => 200,
'order' => 12,
'refund' => 11
)
);
$b=array();
foreach($a as $key=>$val)
{
foreach($val as $key1=>$val1)
{
$b[$key1]+=$val1;
}
}

var_dump($a);
echo "<br />";
var_dump($b);

Answer 2

<?php
$arr = array(
'phone' => array(
'amount' => 100,
'order' => 10,
'refund' => 10
),
'amazon' => array(
'amount' => 200,
'order' => 12,
'refund' => 11
)
);

function add($a, $b){
return $a + $b;
}

var_dump(array_reduce($arr, function($v, $w){
return is_null($v) ? $w : array_map("add", $v, $w);
}));
?>