Symfony 4：如何将$ _SERVER数组作为构造函数参数传递

Question

我正在使用Symfony 4的The DependencyInjection Component，我正在尝试定义配置设置（在config/services.yml中）以创建一个简单的ServerRequest对象。 ServerRequest接收$_SERVER变量（数组）作为构造函数参数$serverParams的参数。

它应该打印数组，但是，它打印字符串“$ _SERVER”：

来自ServerRequest的Hello！

... path-to-project-root / mytests / ServerRequest.php：14：string'$ _SERVER'（length = 8）

也许你有个主意？非常感谢你！

config/services.yml:

parameters:

services:
    _defaults:
        autowire: false
        autoconfigure: true
        public: true

    MyTestsServerRequest:
        arguments:
            $serverParams: $_SERVER

mytests/ServerRequest.php

<?php

namespace MyTests;

class ServerRequest {

    private $serverParams;

    public function __construct($serverParams) {
        $this->serverParams = $serverParams;

        echo 'Hello from ServerRequest!<br/>';

        var_dump($this->serverParams);
    }

}

bootstrap.php

<?php

use SymfonyComponentConfigFileLocator;
use SymfonyComponentDependencyInjectionContainerBuilder;
use SymfonyComponentDependencyInjectionLoaderYamlFileLoader;

/*
 * Include the Composer autoloader.
 */
require __DIR__ . '/vendor/autoload.php';

/*
 * Create dependency injection container.
 */
$container = new ContainerBuilder();
$fileLocator = new FileLocator(__DIR__ . '/config');
$loader = new YamlFileLoader($container, $fileLocator);
$loader->load('services.yml');
$container->compile();

/*
 * Create ServerRequest instance.
 */
$serverRequest = $container->get(MyTestsServerRequest::class);

composer.json

{
    "require": {
        "php": ">=5.5.0",
        "symfony/dependency-injection": "^4.0",
        "symfony/config": "^4.0",
        "symfony/yaml": "^4.0"
    },
    "require-dev": {
        "symfony/console": "^4.0",
        "symfony/event-dispatcher": "^4.0",
        "symfony/process": "^4.0",
        "symfony/lock": "^4.0",
        "symfony/debug": "^4.0",
        "symfony/var-dumper": "^4.0"
    },
    "autoload": {
        "psr-4": {
            "MyTests\": "mytests/"
        }
    }
}