如何获取 Laravel 集合中元素的索引
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【中文标题】如何获取 Laravel 集合中元素的索引【英文标题】:How to get index of element in Laravel collection 【发布时间】:2019-05-08 18:34:00 【问题描述】:如何检索集合中元素的索引? 我的代码:
$users = User::has('posts')->withCount('posts')->orderBy('posts_count')->take(50)->get();
if($users->contains(Auth::id()))
//get the index of auth user id
谢谢你的帮助
【问题讨论】:
【参考方案1】:可以使用集合search()
方法:https://laravel.com/docs/5.7/collections#method-search
$users = User::has('posts')->withCount('posts')->orderBy('posts_count')->take(50)->get();
$userIndex = $users->search(function($user)
return $user->id === Auth::id();
);
请小心,因为索引可能为 0:
// DON'T do this
if($userIndex)
// this will get skipped if the user is the first one in the collection
// Do this instead
if($userIndex !== false)
// this will work
【讨论】:
【参考方案2】:$users = User::has('posts')->withCount('posts')->orderBy('posts_count')->take(50)->get();
// this return a collection. So can do an if like this: $userIndex->count() > 0
$userIndex = $users->filter(function($user)
return $user->id === Auth::id()
);
【讨论】:
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