Laravel - 我可以根据现有数组的“id”值将新项目添加到数组中吗？答案

【问题标题】：Laravel - Can i add new item to an array based on the `id` value existing that array?Laravel - 我可以根据现有数组的“id”值将新项目添加到数组中吗？
【发布时间】：2021-12-10 03:23:43
【问题描述】：

array (
   0 =>
    array (
    'courseId' => 14,
    'tutorName' => 'admin',
    ),
   1 =>
    array (
    'courseId' => 15,
    'tutorName' => 'merl',
    ),
 )

var_export($response) 是一个类似上面的数组。对于$response 数组中的每个courseId，当$response 数组中的courseId 也存在student_learning 表时，我想找到points 的sum。之后，我想将这个点的总和（$points）添加到$response 数组中，作为对应courseId 的新项。在这里，问题是，$points 的每个值都作为新项目添加到 $response 数组的每个数据集中，但我希望它被添加到其各自的 $response 数组中 courseId 仅。我该怎么做？

foreach ($response as $key ) {
           
     $points=DB::table('student_learning')->groupBy('courseId')->where('courseId',$key['courseId'])->sum('points');
     $res = array_map(function($e) use($points,$percent) { 
          $e['points'] = $points;
          return $e; }, $response);
    dump($res);
  }

dump($res) 给出如下输出

array:2 [
  0 => array:8 [
    "courseId" => 14
    "tutorName" => "admin"
    "points" => 12
  ]
  1 => array:8 [
    "courseId" => 15
    "tutorName" => "me"
    "points" => 12
  ]
]
array:2 [
  0 => array:8 [
    "courseId" => 14
    "tutorName" => "admin"
    "points" => 3
  ]
  1 => array:8 [
    "courseId" => 15
    "tutorName" => "me"
    "points" => 3
  ]
]

foreach 之外的dump($res) 给出如下输出

array:2 [
  0 => array:8 [
    "courseId" => 14
    "tutorName" => "admin"
    "points" => 3
  ]
  1 => array:8 [
    "courseId" => 15
    "tutorName" => "me"
    "points" => 3
  ]
]

预期/要求的输出：

  [
    "courseId" => 14
    "tutorName" => "admin"
    "points" => 12
  ]
  [
    "courseId" => 15
    "tutorName" => "me"
    "points" => 3
  ]

【问题讨论】：

所以你需要为每个数组添加点对吗？
@ManojKiranAppathurai 是的。请查看我的预期输出。这就是我想要的
你能分享这两个表结构吗
@ManojKiranAppathurai 我认为答案无论如何都不会连接到表结构

标签： php arrays laravel eloquent laravel-8

【解决方案1】：

您可以在使用 foreach 循环时添加新的数组键

$response  = array (
   0 =>
    array (
    'courseId' => 14,
    'tutorName' => 'admin',
    ),
   1 =>
    array (
    'courseId' => 15,
    'tutorName' => 'merl',
    ),
 );

    $newResponse = [];
  foreach($response as $eachResponse){
    $points=DB::table('student_learning')->groupBy('courseId')->where('courseId',$eachResponse['courseId'])->sum('points');
    
    $eachResponse['points'] = $points;
    $newResponse[] = $eachResponse;
  }
dd($newResponse);

【讨论】：