php实现异步

function asyncOperation($callback) {
    // 模拟异步操作
    setTimeout(function() use ($callback) {
        $result = "异步操作完成";
        $callback($result);
    }, 2000);
}

asyncOperation(function($result) {
    echo $result; // 输出: 异步操作完成
});

class Promise {
    private $callback;

    public function __construct(callable $callback) {
        $this->callback = $callback;
    }

    public function then(callable $onFulfilled) {
        call_user_func($this->callback, function($value) use ($onFulfilled) {
            $onFulfilled($value);
        });
    }
}

$promise = new Promise(function($callback) {
    setTimeout(function() use ($callback) {
        $callback("异步操作完成");
    }, 2000);
});

$promise->then(function($result) {
    echo $result; // 输出: 异步操作完成
});

use Swoole\Coroutine;

Coroutine::create(function() {
    sleep(2);
    echo "异步操作完成\n"; // 输出: 异步操作完成
});

Swoole\Event::wait();

$promise = new Promise(function($callback) {
    setTimeout(function() use ($callback) {
        $callback("异步操作完成");
    }, 2000);
});

$promise->then(function($result) {
    echo $result; // 输出: 异步操作完成
})->catch(function($error) {
    echo $error;
});

pecl install swoole