PHP custom array merge on bases of same value and sum of value

问题

I have array like as follow,

Array(
    [0] => Array(
        [account] => 251234567890,
        [price] => 83
    ) [1] => Array(
        [account] => 251234567890,
        [price] => 27
    ) [2] => Array(
        [account] => 251234564526,
        [price] => 180
    ) [3] => Array(
        [account] => 251234567890,
        [price] => 40
    )
)

now with i want to merge array with same account and sum of it's particular price.

I want output array like this,

Array(
    [251234567890] => Array(
        [account] => 251234567890,
        [price] => 150
    ) [251234564526] => Array(
        [account] => 251234564526,
        [price] => 180
    )
)

I have tried like this,

$res = array();
$k = 0;
foreach ($to_account as $vals) {
  if (array_key_exists($vals['account'], $res)) {
    $res[$k]['price'] += $vals['price'];
    $res[$k]['account'] = $vals['account'];
    $k++;
  } else {
    $res[$k] = $vals;
    $k++;
  }
}

As here in input array only two unique account is present so output array should be of that two account with sum of it's price

I have seen something like this in python from here but it want be helpful as it is in python i want it in php i hope someone can help me in this

Thank you

回答1:

By assigning temporary keys, you can determine whether you are dealing with the first occurrence or not and then use the appropriate technique to either store the whole subarray or merely add value to the price element of the subarray.

Code: (Demo)

$to_account = [
  [ 'account' => 251234567890, 'price' => 83 ],
  [ 'account' => 251234567890, 'price' => 27 ],
  [ 'account' => 251234564526, 'price' => 180 ],
  [ 'account' => 251234567890, 'price' => 40 ]
];

foreach ($to_account as $row) {
    if (!isset($result[$row['account']])) {
        $result[$row['account']] = $row;
    } else {
        $result[$row['account']]['price'] += $row['price'];
    }
}
var_export($result);

Output:

array (
  251234567890 => 
  array (
    'account' => 251234567890,
    'price' => 150,
  ),
  251234564526 => 
  array (
    'account' => 251234564526,
    'price' => 180,
  ),
)

回答2:

I would do this in two steps, first key by the account and then convert to the output format that you want:

$data = [
  [
    'account' => 251234567890,
    'price' => 83
  ],
  [
    'account' => 251234567890,
    'price' => 27
  ],
  [
    'account' => 251234564526,
    'price' => 180
  ],
  [
    'account' => 251234567890,
    'price' => 40
  ],
];


$keyed = [];
foreach ($data as $item) {
  if (!isset($keyed[$item['account']])) {
    $keyed[$item['account']] = 0;
  }
  $keyed[$item['account']] += $item['price'];
}

$merged = [];
foreach ($keyed as $account => $price) {
  $merged[] = compact('account', 'price');
}

print_r($merged);

Or, a more functional solution (which I like, but is somewhat harder to understand):

$keyed = array_reduce($data, function ($carry, $item) {
  if (!isset($carry[$item['account']])) {
    $carry[$item['account']] = 0;
  }
  $carry[$item['account']] += $item['price'];
  return $carry;
}, []);

$merged = array_map(function ($account, $price) {
  return compact('account', 'price');
}, array_keys($keyed), $keyed);

回答3:

what about if you try to do something like:

$arr = array(
    0 => array(
        'account' => 251234567890,
        'price' => 83
    ), 1 => array(
        'account' => 251234567890,
        'price' => 27
    ), 2 =>array(
        'account' => 251234564526,
        'price' => 180
    ), 3 => array(
        'account' => 251234567890,
        'price' => 40
    )
);

foreach($arr as $key => $value) {
    $newArr[$value['account']][] = $value['price'];
}

foreach($newArr as $key => $value) {
    $finalArr[] = array('account'=>$key,'price'=>array_sum($value));
}

$finalArr:

Array ( [0] => Array ( 
[account] => 251234567890 
[price] => 150 ) 
[1] => Array ( 
[account] => 251234564526 
[price] => 180 ) )

回答4:

@Jeroen Noten your answer is useful for me but i have solved it my own like this,

$final_payment_array = array();

foreach ($to_account as $vals) {
     if (array_key_exists($vals['account'], $final_payment_array)) {
            $final_payment_array[$vals['account']]['price'] += $vals['price'];
            $final_payment_array[$vals['account']]['account'] = $vals['account'];
     } else {
            $final_payment_array[$vals['account']] = $vals;
       }
}

I think this one is the best solution in performance wise

Thank you

回答5:

Here is my solution. You can try this

   $myArray = array(

        0 => array(
            account => 251234567890,
            price => 83,
            ),

        1 => array(
            account => 251234567890,
            price => 27,
            ),
        2 => array(
            account => 251234564526,
            price => 180,
            ),
        3 => array(
            account => 251234567890,
            price => 40,
            ),
   );
$keyed = [];
foreach ($myArray as $item) {
  if (!isset($keyed[$item['account']])) {
    $keyed[$item['account']] = 0;
  }
  $keyed[$item['account']] += $item['price'];
}

$merged = [];
foreach ($keyed as $account => $price) {
  $merged[] = compact('account', 'price');
}

print_r($merged);

https://eval.in/506410

来源：https://stackoverflow.com/questions/34945377/php-custom-array-merge-on-bases-of-same-value-and-sum-of-value