php - 如何使用foreach遍历两个相同长度的集合

Question

如果我们想连接两个集合的某些属性，假设它们具有相同的长度，例如:

集合 1:

$collection1 = Collection { ▼
  #items: array:2 [ ▼
    0 => Item { ▼
      +id: 1
      +first_name: 'first_name 1'
      +last_name: 'first_name 1'
      +nbr_hours: 9
    }
    1 => Item { ▼
      +id: 2
      +first_name: 'first_name 2'
      +last_name: 'first_name 2'
      +nbr_hours: 10
    }
  ]
}

集合 2:

$collection2 = Collection { ▼
  #items: array:2 [ ▼
    0 => Item { ▼
      +id: 1
      +first_name: 'first_name 1'
      +last_name: 'first_name 1'
      +nbr_hours: 10
    }
    1 => Item { ▼
      +id: 2
      +first_name: 'first_name 2'
      +last_name: 'first_name 2'
      +nbr_hours: 12
    }
  ]
}

我们如何同时遍历它们并连接 nbr_hours 属性，例如这样输出将类似于:

$nested_collection = Collection { ▼
  #items: array:2 [ ▼
    0 => Item { ▼
      +id: 1
      +first_name: 'first_name 1'
      +last_name: 'first_name 1'
      +nbr_hours: 19
    }
    1 => Item { ▼
      +id: 2
      +first_name: 'first_name 2'
      +last_name: 'first_name 2'
      +nbr_hours: 22
    }
  ]
}

Answer 1

这是一个数组的例子，你可以做些什么来实现这个 -

$c1 = [
['id' => 1, 'hrs' => 9],
['id' => 2, 'hrs' => 12],
];

$c2 = [
['id' => 1, 'hrs' => 10],
['id' => 2, 'hrs' => 11],
];

foreach($c1 as &$c) {
    // get the index for the id from the 2nd array
    $c2_index = array_search($c['id'], array_column($c2, 'id'));
    // Increment the value
    $c['hrs'] += $c2[$c2_index]['hrs'];
}

Demo