<?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\HttpFoundation;

// Help opcache.preload discover always-needed symbols
class_exists(AcceptHeaderItem::class);

/**
 * Represents an Accept-* header.
 *
 * An accept header is compound with a list of items,
 * sorted by descending quality.
 *
 * @author Jean-François Simon <contact@jfsimon.fr>
 */
class AcceptHeader
{
    /**
     * @var AcceptHeaderItem[]
     */
    private array $items = [];

    private bool $sorted = true;

    /**
     * @param AcceptHeaderItem[] $items
     */
    public function __construct(array $items)
    {
        foreach ($items as $item) {
            $this->add($item);
        }
    }

    /**
     * Builds an AcceptHeader instance from a string.
     */
    public static function fromString(?string $headerValue): self
    {
        $index = 0;

        $parts = HeaderUtils::split($headerValue ?? '', ',;=');

        return new self(array_map(function ($subParts) use (&$index) {
            $part = array_shift($subParts);
            $attributes = HeaderUtils::combine($subParts);

            $item = new AcceptHeaderItem($part[0], $attributes);
            $item->setIndex($index++);

            return $item;
        }, $parts));
    }

    /**
     * Returns header value's string representation.
     */
    public function __toString(): string
    {
        return implode(',', $this->items);
    }

    /**
     * Tests if header has given value.
     */
    public function has(string $value): bool
    {
        return isset($this->items[$value]);
    }

    /**
     * Returns given value's item, if exists.
     */
    public function get(string $value): ?AcceptHeaderItem
    {
        return $this->items[$value] ?? $this->items[explode('/', $value)[0].'/*'] ?? $this->items['*/*'] ?? $this->items['*'] ?? null;
    }

    /**
     * Adds an item.
     *
     * @return $this
     */
    public function add(AcceptHeaderItem $item): static
    {
        $this->items[$item->getValue()] = $item;
        $this->sorted = false;

        return $this;
    }

    /**
     * Returns all items.
     *
     * @return AcceptHeaderItem[]
     */
    public function all(): array
    {
        $this->sort();

        return $this->items;
    }

    /**
     * Filters items on their value using given regex.
     */
    public function filter(string $pattern): self
    {
        return new self(array_filter($this->items, function (AcceptHeaderItem $item) use ($pattern) {
            return preg_match($pattern, $item->getValue());
        }));
    }

    /**
     * Returns first item.
     */
    public function first(): ?AcceptHeaderItem
    {
        $this->sort();

        return !empty($this->items) ? reset($this->items) : null;
    }

    /**
     * Sorts items by descending quality.
     */
    private function sort(): void
    {
        if (!$this->sorted) {
            uasort($this->items, function (AcceptHeaderItem $a, AcceptHeaderItem $b) {
                $qA = $a->getQuality();
                $qB = $b->getQuality();

                if ($qA === $qB) {
                    return $a->getIndex() > $b->getIndex() ? 1 : -1;
                }

                return $qA > $qB ? -1 : 1;
            });

            $this->sorted = true;
        }
    }
}

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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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