Collection in Laravel是一个API包装器，它帮助您处理在数组上执行的不同操作。它使用Illuminate\Support\Collection类来处理Laravel中的数组。
要从给定的数组创建一个集合，您需要使用collect()辅助方法，它返回一个集合实例。之后，您可以在集合实例上使用一系列方法，如转换为小写，对集合进行排序。
Example 1
的中文翻译为：示例1
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use Illuminate\Support\Collection;
class UserController extends Controller{
public function index() {
$mynames = collect(['Andria', 'Josh', 'James', 'Miya', 'Henry']);
print_r($mynames);
}
}
输出
当您在浏览器中测试相同内容时，您将获得以下输出−
Illuminate\Support\Collection Object(
[items:protected] => Array(
[0] => Andria
[1] => Josh
[2] => James
[3] => Miya
[4] => Henry
)
[escapeWhenCastingToString:protected] =>
)
要添加新值，您可以使用集合上的 push() 或 put() 方法。
示例 2
使用push()方法。
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use Illuminate\Support\Collection;
class UserController extends Controller{
public function index() {
$mynames = collect(['Andria', 'Josh', 'James', 'Miya', 'Henry']);
$mynames->push('Heena');
print_r($mynames);
}
}
输出
上述代码的输出是 -
Illuminate\Support\Collection Object(
[items:protected] => Array(
[0] => Andria
[1] => Josh
[2] => James
[3] => Miya
[4] => Henry
[5] => Heena
)
[escapeWhenCastingToString:protected] =>
)
示例 3
使用put()方法
当您有一个带有键：值对的集合时，使用put()方法
['firstname' => 'Siya', 'lastname' => 'Khan', 'address'=>'xyz']
让我们利用put()方法将一个键值对添加到上述集合中。
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use Illuminate\Support\Collection;
class UserController extends Controller{
public function index() {
$stdDetails = collect(['firstname' => 'Siya', 'lastname' => 'Khan', 'address'=>'xyz']);
$stdDetails->put('age','30');
print_r($stdDetails);
}
}
输出
上述代码的输出是 -
Illuminate\Support\Collection Object(
[items:protected] => Array(
[firstname] => Siya
[lastname] => Khan
[address] => xyz
[age] => 30
)
[escapeWhenCastingToString:protected] =>
)
Example 4
的中文翻译为：示例4
使用带有数组值的集合推送。
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use Illuminate\Support\Collection;
class UserController extends Controller{
public function index() {
$myNames = collect([
['userid'=>1, 'name'=>'Andria'],
['userid'=>2, 'name'=>'Josh'],
['userid'=>3, 'name'=>'James']
]);
$myNames->push(['userid'=>4, 'name'=>'Miya']);
print_r($myNames);
}
}
输出
上述代码的输出是 -
Illuminate\Support\Collection Object(
[items:protected] => Array(
[0] => Array(
[userid] => 1
[name] => Andria
)
[1] => Array(
[userid] => 2
[name] => Josh
)
[2] => Array(
[userid] => 3
[name] => James
)
[3] => Array(
[userid] => 4
[name] => Miya
)
)
[escapeWhenCastingToString:protected] =>
)
