raravel组由数组 - 非法字符串偏移

Question

我已经将CSV文件转换为数组，并将数组数据分组为一些键。我定义了一个组函数来处理数组数据。但是，我面临此错误，不确定哪个部分出错。

代码：Groupby功能

public function group($key, $item) {
        $result = array();
        foreach($item as $val) {
                $result[$val[$key]][] = $val; <--error $key
        }
        return $result;
    }

数据转换功能。

public function saveNewSale()
    { 
        foreach (array_chunk($items, $chunk_size) as $chunk) {
                $cleaned_items = [];
                foreach ($chunk as $item) {
                    //Data Transformation
                    //call groupby function
                    $byGroup = $this->group('ref_num', $item);
                    array_push($cleaned_items, $item);
                }

这是我的数组

array:2 [
  0 => array:13 [
    "ref_num" => "INV699"
    "payment_term" => array:2 [
      "id" => 1
      "name" => "Cash"
    ]
    "items" => array:1 [
      0 => array:8 [
        "code" => "3MVR0003"
        "description" => "3M Vinyl 
        "tax_value" => 0.06
        "qty" => 1
        "unit" => 1
        "price" => 10
        "total" => 212
        "total_tax" => 12
      ]
    ]
    "terms" => array:1 [
      0 => array:2 [
        "date" => "2019-02-20"
        "amount" => 200
      ]
    ]
  ]
  1 => array:13 [
    "ref_num" => "INV699"
    "payment_term" => array:2 [
      "id" => 1
      "name" => "Cash"
    ]
    "items" => array:1 [
      0 => array:8 [
        "code" => "sony"
        "description" => "3xperia"
        "tax_value" => 0.06
        "qty" => 1
        "unit" => 1
        "price" => 10
        "total" => 212
        "total_tax" => 12
      ]
    ]
    "terms" => array:1 [
      0 => array:2 [
        "date" => "2019-02-20"
        "amount" => 200
      ]
    ]
  ]
]

我需要基于ref_num。

Answer 1

我在saveNewSale中重写您的代码，然后删除group功能

public function saveNewSale($items)
{ 
    $groupedArray = [];
    foreach (array_chunk($items, 2) as $chunk) 
    {
        foreach($chunk as $entry) {
            $groupedArray[$entry['ref_num']][]= $entry; 
        }
    }
    return $groupedArray;
}

这是有效的示例