php 静态块

class Config {
    public static $dbHost = 'localhost';
    public static $dbUser = 'user';
    public static $dbPass = 'password';

    public static function getDbConfig() {
        return [
            'host' => self::$dbHost,
            'user' => self::$dbUser,
            'pass' => self::$dbPass
        ];
    }
}

// 访问静态变量
echo Config::$dbHost; // 输出: localhost

// 调用静态方法
$dbConfig = Config::getDbConfig();
print_r($dbConfig);

class Example {
    public $nonStaticVar = 'Hello';

    public static function accessNonStatic() {
        // 错误：静态方法不能访问非静态成员
        // echo $this->nonStaticVar;

        // 正确：创建类的实例
        $instance = new self();
        echo $instance->nonStaticVar;
    }
}

class ThreadSafeCounter {
    private static $counter = 0;
    private static $lock;

    public static function increment() {
        if (self::$lock === null) {
            self::$lock = new \Swoole\Lock(SWOOLE_MUTEX);
        }
        self::$lock->lock();
        self::$counter++;
        self::$lock->unlock();
    }

    public static function getCounter() {
        return self::$counter;
    }
}