Question

我有一个问题，我有这个数组：

Array
(
[0] => Array
    (
        [date] => 2015-07-07
        [nb] => 12
    )

[1] => Array
    (
        [date] => 2015-07-10
        [nb] => 6
    )

[2] => Array
    (
        [date] => 2015-07-07
        [nb] => 8
    )

[3] => Array
    (
        [date] => 2015-07-09
        [nb] => 48
    )

[4] => Array
    (
        [date] => 2015-07-09
        [nb] => 42
    )
 }

但我想获得这个：

Array
(
 [0] => Array
  (
    [date] => 2015-07-07
    [nb] => 20
  )

 [1] => Array
  (
    [date] => 2015-07-09
    [nb] => 90
   )

 [2] => Array
  (
    [date] => 2015-07-10
    [nb] => 6
   )
 }

这个想法是，如果在数组中存在多个日期[nb]必须加起来。

我试过这样：

foreach($aTotalRows as $k=>$row){
  if($row[$k]['date'] == $row[$k+1]['date']){
    $row[$k]['nb'] = $row[$k]['nb'] + $row[$k+1]['nb'] 
  }
}

但不能解决这个问题，你能帮帮我吗？ Thx提前

Answer 1

不，这只有在您按日期排序时才有效....尝试构建类似的内容：

$aggregateArray = array();
foreach($aTotalRows as $row) {
    if(!array_key_exists($row['date'], $aggregateArray) {
        $aggregateArray[$row['date']] = 0;
    }
    $aggregateArray[$row['date']] += $row['nb'] 
}

会给你类似的东西：

Array(
    ['2015-07-07'] => 20
    ['2015-07-10'] => 90
    ['2015-07-11'] => 6
)

然后你可以在必要时进行重组

Answer 2

如果要处理未排序的数组，则必须更改类似的代码，

$input = array(
    array('date' => '2015-07-07', 'nb' => 12),
    array('date' => '2015-07-10', 'nb' => 6),
    array('date' => '2015-07-07', 'nb' => 8),
    array('date' => '2015-07-09', 'nb' => 48),
    array('date' => '2015-07-09', 'nb' => 42)
 );

$required = array();

array_walk($input, function($v) use(&$required){
    if(!isset($required[$v['date']])){ $required[$v['date']] = 0; }
    $required[$v['date']] += $v['nb'];
});

$final = array_map(function($v, $k){
            return array('date'=>$k, 'nb'=>$v);
        }, $required, array_keys($required));

转储$required

array (size=3)
  '2015-07-07' => int 20
  '2015-07-10' => int 6
  '2015-07-09' => int 90

转储$final

array (size=3)
  0 => 
    array (size=2)
      'date' => string '2015-07-07' (length=10)
      'nb' => int 20
  1 => 
    array (size=2)
      'date' => string '2015-07-10' (length=10)
      'nb' => int 6
  2 => 
    array (size=2)
      'date' => string '2015-07-09' (length=10)
      'nb' => int 90

Answer 3

你可以在一条路上做到这一点

TupleElement

如果具有相同的日期

3 个答案: