Laravel 8 groupBy() {#collection-method}
2021-07-19 09:38 更新
groupBy 方法根据指定键对集合项进行分组：
$collection = collect([
['account_id' => 'account-x10', 'product' => 'Chair'],
['account_id' => 'account-x10', 'product' => 'Bookcase'],
['account_id' => 'account-x11', 'product' => 'Desk'],
]);
$grouped = $collection->groupBy('account_id');
$grouped->all();
/*
[
'account-x10' => [
['account_id' => 'account-x10', 'product' => 'Chair'],
['account_id' => 'account-x10', 'product' => 'Bookcase'],
],
'account-x11' => [
['account_id' => 'account-x11', 'product' => 'Desk'],
],
]
*/ 你可以传递一个回调函数来代替一个字符串的 键。这个回调函数应该返回你希望用来分组的键的值：
$grouped = $collection->groupBy(function ($item, $key) {
return substr($item['account_id'], -3);
});
$grouped->all();
/*
[
'x10' => [
['account_id' => 'account-x10', 'product' => 'Chair'],
['account_id' => 'account-x10', 'product' => 'Bookcase'],
],
'x11' => [
['account_id' => 'account-x11', 'product' => 'Desk'],
],
]
*/ 可以传递一个数组用于多重分组标准。每一个数组元素将对应多维数组内的相应级别：
$data = new Collection([
10 => ['user' => 1, 'skill' => 1, 'roles' => ['Role_1', 'Role_3']],
20 => ['user' => 2, 'skill' => 1, 'roles' => ['Role_1', 'Role_2']],
30 => ['user' => 3, 'skill' => 2, 'roles' => ['Role_1']],
40 => ['user' => 4, 'skill' => 2, 'roles' => ['Role_2']],
]);
$result = $data->groupBy([
'skill',
function ($item) {
return $item['roles'];
},
], $preserveKeys = true);
/*
[
1 => [
'Role_1' => [
10 => ['user' => 1, 'skill' => 1, 'roles' => ['Role_1', 'Role_3']],
20 => ['user' => 2, 'skill' => 1, 'roles' => ['Role_1', 'Role_2']],
],
'Role_2' => [
20 => ['user' => 2, 'skill' => 1, 'roles' => ['Role_1', 'Role_2']],
],
'Role_3' => [
10 => ['user' => 1, 'skill' => 1, 'roles' => ['Role_1', 'Role_3']],
],
],
2 => [
'Role_1' => [
30 => ['user' => 3, 'skill' => 2, 'roles' => ['Role_1']],
],
'Role_2' => [
40 => ['user' => 4, 'skill' => 2, 'roles' => ['Role_2']],
],
],
];
*/ 以上内容是否对您有帮助：
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