对集合只显示指定字段

$lists = UserService::tagList();
$lists = $lists->map(function ($item) {
    return [
        'id' => $item->id,
        'tag_name' => $item->tag_name,
    ];
});

普通集合

$a = collect(['a','b']);
$a->push('c');
dd($a);
                
$a = collect(['id'=>1,'b'=>2]);
$a->put('c', '3');
dd($a);

$collection = collect([
    ['id'=>1, 'name'=>'Hardik'],
    ['id'=>2, 'name'=>'Harsukh'],
    ['id'=>3, 'name'=>'Bhagat'],
]);
$collection->push(['id'=>4, 'name'=>'vimal']);
$collection->all();
dd($collection);

新增元素

$action = Action::where('id',52)->first();
$action = collect($action);
$action->put('role','admin');
dd($action->toArray());

新增元素

$action = Action::whereIn('id',[52,56])->get();
$action->map(function ($post) {
    $post['url'] = 'http://your.url/here';
    return $post;
});
dd($action->toArray());

删除元素

$action = Action::select('id','action_name','start_date','end_date')->whereIn('id',[52,56])->get();
$action = $action->map(function ($post) {
        unset($post['action_name']);
        return $post;
});
dd($action->toArray());

新增元素

$param = 'test';
$action = Action::select('id','action_name','start_date','end_date')->whereIn('id',[52,56])->get();
$action->map(function($d) use($param) {
    $d['starttime'] = $d['starttime'];
    return $d;
});
dd($action->toArray());

https://www.itsolutionstuff.com/post/laravel-collection-push-and-put-exampleexample.html

删除元素

$collection = collect([
    ['name' => 'Desk', 'price' => 200],
    ['name' => 'Chair', 'price' => 100],
    ['name' => 'Bookcase', 'price' => 150],
]);
$collection->forget(0);
$collection = $collection->values()->all();
dd($collection);

一个复杂一些的过滤加排序

$items=[
    ["num"=>17,"status"=>0,"grade"=>5],
    ["num"=>17,"status"=>2,"grade"=>4],
    ["num"=>7,"status"=>1,"grade"=>6],
    ["num"=>17,"status"=>0,"grade"=>3],
];
$ucsCollect=collect($items);
//过滤
$ucsCollect=$ucsCollect->filter(function ($item, $key) {
    return $item['num'] > 14;
});
//倒序排序
$ucsList=$ucsCollect->sortByDesc(function ($item, $key) {
    return $item['grade'];
    //正序排序
})->sortBy(function ($item, $key) {
    return $item['status'];
});
$ucsList = $ucsList->values()->all();
dd($ucsList);

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