循环遍历子数组中的键值重复项

Question

I'm trying to iterate through a simple array of arrays, then if I find duplicates of 'id' value in a sub arrays, group them and iterate through them.

This can be obvious for you but I can't find a simple way to do this.

Example:

$records = array(
    array(
        'id' => 2135,
        'start' => 'january',
        'end' => 'march',
        'color' => 'blue'
    ),
    array(
        'id' => 2135,
        'start' => 'march',
        'end' => 'april',
        'color' => 'red'
    ),
    array(
        'id' => 5342,
        'start' => 'january',
        'end' => 'july',
        'color' => 'black'
    ),
    array(
        'id' => 5623,
        'start' => 'march',
        'key' => 'august',
        'color' => 'green'
    ),
    array(
        'id' => 5342,
        'start' => 'april',
        'end' => 'june',
        'color' => 'purple'
    )
);

Result needed:

All entries of id 2135 must be set to color blue.
All entries of id 5342 must be set to color black.

Answer 1

Try this solution

    $records = array(
        array(
            'id' => 2135,
            'start' => 'january',
            'end' => 'march',
            'color' => 'blue'
        ),
        array(
            'id' => 2135,
            'start' => 'march',
            'end' => 'april',
            'color' => 'red'
        ),
        array(
            'id' => 5342,
            'start' => 'january',
            'end' => 'july',
            'color' => 'black'
        ),
        array(
            'id' => 5623,
            'start' => 'march',
            'key' => 'august',
            'color' => 'green'
        ),
        array(
            'id' => 5342,
            'start' => 'april',
            'end' => 'june',
            'color' => 'purple'
        )
    );
    $collection = collect($records);
    $grouped = $collection->groupBy('id')->map(function($entries, $key){
        $color = collect($entries)->first()['color'];
        $e = $entries->toArray();
        foreach ($e as $key => $value) {
            $e[$key]['color'] = $color;
        }
        return $e;
    })->values()->all();
    dd($grouped);

Outputs

    array:3 [▼
      0 => array:2 [▼
        0 => array:4 [▼
          "id" => 2135
          "start" => "january"
          "end" => "march"
          "color" => "blue"
        ]
        1 => array:4 [▼
          "id" => 2135
          "start" => "march"
          "end" => "april"
          "color" => "blue"
        ]
      ]
      1 => array:2 [▼
        0 => array:4 [▼
          "id" => 5342
          "start" => "january"
          "end" => "july"
          "color" => "black"
        ]
        1 => array:4 [▼
          "id" => 5342
          "start" => "april"
          "end" => "june"
          "color" => "black"
        ]
      ]
      2 => array:1 [▼
        0 => array:4 [▼
          "id" => 5623
          "start" => "march"
          "key" => "august"
          "color" => "green"
        ]
      ]
    ]

Hope this help