你知道Laravel Collection的实际使用场景有哪些吗？

下面由laravel教程栏目给大家介绍laravel collection的实际使用场景，希望对需要的朋友有所帮助！

laravel

      1,    'user_id'       =>      1,    'number'        =>      '13908080808',    'status'        =>      0,    'fee'           =>      10,    'discount'      =>      44,    'order_products'=> [        ['order_id'=>1,'product_id'=>1,'param'=>'6寸','price'=>555.00,'product'=>['id'=>1,'name'=>'蛋糕名称','images'=>[]]],        ['order_id'=>1,'product_id'=>1,'param'=>'7寸','price'=>333.00,'product'=>['id'=>1,'name'=>'蛋糕名称','images'=>[]]],    ],]];

登录后复制

$sum = 0;foreach ($orders as $order) {    foreach ($order['order_products'] as $item) {        $sum += $item['price'];    }}echo $sum;

登录后复制

$sum = collect($orders)->map(function($order){    return $order['order_products'];})->flatten(1)->map(function($order){    return $order['price'];})->sum();echo $sum;

登录后复制

$sum = collect($orders)->flatMap(function($order){    return $order['order_products'];})->pluck('price')->sum();echo $sum;

登录后复制

$sum = collect($orders)->flatMap(function($order){    return $order['order_products'];})->sum('price');

登录后复制

// 带格式化数组$gates = [    'BaiYun_A_A17',    'BeiJing_J7',    'ShuangLiu_K203',    'HongQiao_A157',    'A2',    'BaiYun_B_B230'];// 新数组$boards = [    'A17',    'J7',    'K203',    'A157',    'A2',    'B230'];

登录后复制

$res = [];foreach($gates as $key => $gate) {    if(strpos($gate, '_') === false) {        $res[$key] = $gate;    }else{        $offset = strrpos($gate, '_') + 1;        $res[$key] = mb_substr($gate , $offset);    }}var_dump($res);

登录后复制

$res = collect($gates)->map(function($gate) {    $parts = explode('_', $gate);    return end($parts);});

登录后复制

$res = collect($gates)->map(function($gate) {    return collect(explode('_', $gate))->last();})->toArray();

登录后复制

$opts = [        'http' => [                'method' => 'GET',                'header' => [                        'User-Agent: PHP'                ]        ]];$context = stream_context_create($opts);$events = json_decode(file_get_contents('http://api.github.com/users/0xAiKang/events', false, $context), true);

登录后复制

$eventTypes = []; // 事件类型$score = 0; // 总得分foreach ($events as $event) {    $eventTypes[] = $event['type'];}foreach($eventTypes as $eventType) {    switch ($eventType) {        case 'PushEvent':        $score += 5;        break;        case 'CreateEvent':        $score += 4;        break;        case 'IssueEvent':        $score += 3;        break;        case 'IssueCommentEvent':        $score += 2;        break;        default:        $score += 1;        break;    }}

登录后复制

$score = $events->pluck('type')->map(function($eventType) {   switch ($eventType) {      case 'PushEvent':      return 5;      case 'CreateEvent':      return 4;      case 'IssueEvent':      return 3;      case 'IssueCommentEvent':      return 2;      default:      return 1;  }})->sum();

登录后复制

$score = $events->pluck('type')->map(function($eventType) {   return collect([       'PushEvent'=> 5,       'CreateEvent'=> 4,       'IssueEvent'=> 3,       'IssueCommentEvent'=> 2   ])->get($eventType, 1); // 如果不存在则默认等于1})->sum();

登录后复制

class GithubScore {    private $events;    private function __construct($events){        $this->events = $events;    }    public static function score($events) {        return (new static($events))->scoreEvents();    }    private function scoreEvents() {        return $this->events->pluck('type')->map(function($eventType){            return $this->lookupEventScore($eventType, 1);        })->sum();    }    public function lookupEventScore($eventType, $default_value) {       return collect([           'PushEvent'=> 5,           'CreateEvent'=> 4,           'IssueEvent'=> 3,           'IssueCommentEvent'=> 2       ])->get($eventType, $default_value); // 如果不存在则默认等于1    }}var_dump(GithubScore::score($events));

登录后复制

$messages = [    'Should be working now for all Providers.',    'If you see one where spaces are in the title let me know.',    'But there should not have blank in the key of config or .env file.'];// 格式化之后的结果- Should be working now for all Providers. \n- If you see one where spaces are in the title let me know. \n- But there should not have blank in the key of config or .env file.

登录后复制

$comment = '- ' . array_shift($messages);foreach ($messages as $message) {    $comment .= "\n -  ${message}";}var_dump($comment);

登录后复制

$comment = collect($messages)->map(function($message){    return '- ' . $message;})->implode("\n");var_dump($comment);

登录后复制

$lastYear = [    6345.75,    9839.45,    7134.60,    9479.50,    9928.0,    8652.00,    7658.40,    10245.40,    7889.40,    3892.40,    3638.40,    2339.40];$thisYear = [    6145.75,    6895.00,    3434.00,    9349350,    9478.60,    7652.80,    4758.40,    10945.40,    3689.40,    8992.40,    7588.40,    2239.40];

登录后复制

$profit = [];foreach($thisYear as $key => $monthly){    $profit[$key] = $monthly - $lastYear[$key];}var_dump($profit);

登录后复制

$profit = collect($thisYear)->zip($lastYear)->map(function($monthly){    return $monthly->first() - $monthly->last();});

登录后复制

$employees = [    [        'name' => 'example',        'email' => 'example@exmaple.com',        'company' => 'example Inc.'    ],    [        'name' => 'Lucy',        'email' => 'lucy@example.com',        'company' => 'ibm Inc.'    ],    [        'name' => 'Taylor',        'email' => 'toylor@laravel.com',        'company'=>'Laravel Inc.'    ]];// 格式化之后的结果$lookup = [    'example' => 'example@example.com',    'Lucy' => ‘lucy@example.com’,    'Taylor'=> 'toylor@laravel.com'];

登录后复制

$emails = [];foreach ($employees as $key => $value) {    $emails[$value['name']] = $value['email'];}

登录后复制

$emails = collect($employees)->reduce(function($emailLookup, $employee){    $emailLookup[$employee['name']] = $employee['email'];    return $emailLookup;},[]);

登录后复制

$emails = collect($employees)->pluck('name', 'email');

登录后复制

以上就是你知道Laravel Collection的实际使用场景有哪些吗？的详细内容，更多请关注【创想鸟】其它相关文章！