CodeIgniter 4 中利用服务优化通用功能类的内存管理

// app/Libraries/ExampleLibrary.php
namespace App\Libraries;

class ExampleLibrary
{
    public function performDataAnalysis(array $data): array
    {
        // 模拟数据分析和格式化
        return array_map(function($item) {
            return strtoupper($item) . '_PROCESSED';
        }, $data);
    }

    public function filterContent(string $message, array $rules): string
    {
        // 模拟内容过滤
        foreach ($rules as $rule) {
            if (strpos($message, $rule) !== false) {
                return "Filtered: " . $message;
            }
        }
        return $message;
    }
}

// app/Config/Services.php

// ... 其他服务定义

class Services extends BaseService
{
    // ... 其他默认服务

    /**
     * 提供 ExampleLibrary 的共享实例。
     *
     * @param bool $getShared 是否返回共享实例。
     * @return \App\Libraries\ExampleLibrary
     */
    public static function exampleService(bool $getShared = true): \App\Libraries\ExampleLibrary
    {
        if ($getShared) {
            // 如果请求共享实例，则尝试获取或创建并存储共享实例
            return static::getSharedInstance('exampleService');
        }

        // 否则，返回一个新的实例
        return new \App\Libraries\ExampleLibrary();
    }
}

// app/Controllers/Home.php
namespace App\Controllers;

use App\Libraries\ExampleLibrary; // 引入类，用于类型提示

class Home extends BaseController
{
    /**
     * @var ExampleLibrary
     */
    protected $exampleLibrary;

    public function __construct()
    {
        // 在构造函数中获取共享实例
        $this->exampleLibrary = service('exampleService');
    }

    public function index()
    {
        $data = ['item1', 'item2', 'item3'];
        $processedData = $this->exampleLibrary->performDataAnalysis($data);

        $message = "This is a test message with sensitive info.";
        $filteredMessage = $this->exampleLibrary->filterContent($message, ['sensitive']);

        echo "Processed Data: " . implode(', ', $processedData) . "<br>";
        echo "Filtered Message: " . $filteredMessage;
    }

    public function anotherMethod()
    {
        // 再次访问，仍然是同一个共享实例
        $anotherProcessedData = $this->exampleLibrary->performDataAnalysis(['new_item']);
        echo "Another Processed Data: " . implode(', ', $anotherProcessedData);
    }
}