PHP 8.4の新しいクローズメソッド – リソース管理が簡単に！

class MyResource {
    public function close(): void {
    // リソースの解放処理
    }
}

function useResource() {
    $resource = new MyResource();
    // リソースの利用
} // ここで自動的にclose()が呼び出される

class FileHandler {
    private $handle;

    public function __construct(string $filename) {
        $this->handle = fopen($filename, 'r');
    }

    public function close(): void {
        fclose($this->handle);
    }
}

class SocketHandler {
    private $socket;

    public function __construct($host, $port) {
        $this->socket = fsockopen($host, $port);
    }

    public function close(): void {
        fclose($this->socket);
    }
}

class ResourceManager {
    private $resources = [];

    public function addResource(MyResource $resource): void {
        $this->resources[] = $resource;
    }

    public function close(): void {
        foreach ($this->resources as $resource) {
            $resource->close();
        }
    }
}

function processWithErrorHandling() {
    $resource = new MyResource();
    try {
        // 処理内容
    } finally {
        $resource->close();
    }
}

class MyResourceTest extends PHPUnit\Framework\TestCase {
    public function testClose(): void {
        $resource = new MyResource();
        $this->assertNull($resource->close());
    }
}