<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\EventDispatcher;

use Symfony\Contracts\EventDispatcher\EventDispatcherInterface as ContractsEventDispatcherInterface;

/**
 * The EventDispatcherInterface is the central point of Symfony's event listener system.
 * Listeners are registered on the manager and events are dispatched through the
 * manager.
 *
 * @author Bernhard Schussek <bschussek@gmail.com>
 */
interface EventDispatcherInterface extends ContractsEventDispatcherInterface
{
    /**
     * Adds an event listener that listens on the specified events.
     *
     * @param int $priority The higher this value, the earlier an event
     *                      listener will be triggered in the chain (defaults to 0)
     */
    public function addListener(string $eventName, callable $listener, int $priority = 0);

    /**
     * Adds an event subscriber.
     *
     * The subscriber is asked for all the events it is
     * interested in and added as a listener for these events.
     */
    public function addSubscriber(EventSubscriberInterface $subscriber);

    /**
     * Removes an event listener from the specified events.
     */
    public function removeListener(string $eventName, callable $listener);

    public function removeSubscriber(EventSubscriberInterface $subscriber);

    /**
     * Gets the listeners of a specific event or all listeners sorted by descending priority.
     *
     * @return array<callable[]|callable>
     */
    public function getListeners(string $eventName = null): array;

    /**
     * Gets the listener priority for a specific event.
     *
     * Returns null if the event or the listener does not exist.
     */
    public function getListenerPriority(string $eventName, callable $listener): ?int;

    /**
     * Checks whether an event has any registered listeners.
     */
    public function hasListeners(string $eventName = null): bool;
}

• [D] Attribute
• [D] Debug
• [D] DependencyInjection
• [F] CHANGELOG.md
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• [F] composer.json
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• [F] EventDispatcher.php
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• [F] EventDispatcherInterface.php
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• [F] EventSubscriberInterface.php
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• [F] GenericEvent.php
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• [F] ImmutableEventDispatcher.php
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• [F] LICENSE
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• [F] README.md
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Enhancing Payment Security: The Role of Encryption and Tokenization in Digital Transactions

As digital transactions proliferate, ensuring robust payment security is more critical than ever. Two foundational technologies that are pivotal in this effort are encryption and tokenization.
Encryption is a process that transforms data into a secure format, known as ciphertext, which can only be deciphered using a specific decryption key. This means that even if data is intercepted during transmission, it remains unreadable and protected from unauthorized access. Encryption is essential in safeguarding sensitive payment information, such as credit card details and personal data, during online transactions.
Tokenization, on the other hand, involves substituting sensitive data with unique identifiers or "tokens." These tokens serve as placeholders and have no value outside of the specific transaction context. If intercepted, tokens are meaningless and cannot be used to access the original sensitive data. This method significantly reduces the risk of fraud and data breaches, as the actual payment information is not stored or transmitted.
Together, encryption and tokenization form a powerful security framework. Encryption ensures that data is protected during transmission, while tokenization minimizes the risk of exposing sensitive information by replacing it with secure, non-sensitive tokens.
These technologies are integral to modern payment platforms, providing a robust defense against cyber threats. By implementing advanced encryption and tokenization techniques, businesses can enhance the security of digital transactions, ensuring that users' financial and personal information remains safe. This comprehensive approach not only builds user trust but also fortifies the overall security infrastructure of digital payment systems. As cyber threats evolve, the continued advancement of encryption and tokenization will be crucial in maintaining secure and reliable payment processes.

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