<?php

declare(strict_types=1);

namespace GuzzleHttp\Psr7;

use Psr\Http\Message\StreamInterface;

/**
 * Compose stream implementations based on a hash of functions.
 *
 * Allows for easy testing and extension of a provided stream without needing
 * to create a concrete class for a simple extension point.
 */
#[\AllowDynamicProperties]
final class FnStream implements StreamInterface
{
    private const SLOTS = [
        '__toString', 'close', 'detach', 'rewind',
        'getSize', 'tell', 'eof', 'isSeekable', 'seek', 'isWritable', 'write',
        'isReadable', 'read', 'getContents', 'getMetadata',
    ];

    /** @var array<string, callable> */
    private $methods;

    /**
     * @param array<string, callable> $methods Hash of method name to a callable.
     */
    public function __construct(array $methods)
    {
        $this->methods = $methods;

        // Create the functions on the class
        foreach ($methods as $name => $fn) {
            $this->{'_fn_'.$name} = $fn;
        }
    }

    /**
     * Lazily determine which methods are not implemented.
     *
     * @throws \BadMethodCallException
     */
    public function __get(string $name): void
    {
        throw new \BadMethodCallException(str_replace('_fn_', '', $name)
            .'() is not implemented in the FnStream');
    }

    /**
     * The close method is called on the underlying stream only if possible.
     */
    public function __destruct()
    {
        if (isset($this->_fn_close)) {
            ($this->_fn_close)();
        }
    }

    /**
     * An unserialize would allow the __destruct to run when the unserialized value goes out of scope.
     *
     * @throws \LogicException
     */
    public function __wakeup(): void
    {
        throw new \LogicException('FnStream should never be unserialized');
    }

    /**
     * Adds custom functionality to an underlying stream by intercepting
     * specific method calls.
     *
     * @param StreamInterface         $stream  Stream to decorate
     * @param array<string, callable> $methods Hash of method name to a closure
     *
     * @return FnStream
     */
    public static function decorate(StreamInterface $stream, array $methods)
    {
        // If any of the required methods were not provided, then simply
        // proxy to the decorated stream.
        foreach (array_diff(self::SLOTS, array_keys($methods)) as $diff) {
            /** @var callable $callable */
            $callable = [$stream, $diff];
            $methods[$diff] = $callable;
        }

        return new self($methods);
    }

    public function __toString(): string
    {
        try {
            /** @var string */
            return ($this->_fn___toString)();
        } catch (\Throwable $e) {
            if (\PHP_VERSION_ID >= 70400) {
                throw $e;
            }
            trigger_error(sprintf('%s::__toString exception: %s', self::class, (string) $e), E_USER_ERROR);

            return '';
        }
    }

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

    public function detach()
    {
        return ($this->_fn_detach)();
    }

    public function getSize(): ?int
    {
        return ($this->_fn_getSize)();
    }

    public function tell(): int
    {
        return ($this->_fn_tell)();
    }

    public function eof(): bool
    {
        return ($this->_fn_eof)();
    }

    public function isSeekable(): bool
    {
        return ($this->_fn_isSeekable)();
    }

    public function rewind(): void
    {
        ($this->_fn_rewind)();
    }

    public function seek($offset, $whence = SEEK_SET): void
    {
        ($this->_fn_seek)($offset, $whence);
    }

    public function isWritable(): bool
    {
        return ($this->_fn_isWritable)();
    }

    public function write($string): int
    {
        return ($this->_fn_write)($string);
    }

    public function isReadable(): bool
    {
        return ($this->_fn_isReadable)();
    }

    public function read($length): string
    {
        return ($this->_fn_read)($length);
    }

    public function getContents(): string
    {
        return ($this->_fn_getContents)();
    }

    /**
     * @return mixed
     */
    public function getMetadata($key = null)
    {
        return ($this->_fn_getMetadata)($key);
    }
}

• [D] Exception
• [F] AppendStream.php
  Delete
• [F] BufferStream.php
  Delete
• [F] CachingStream.php
  Delete
• [F] DroppingStream.php
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• [F] FnStream.php
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• [F] Header.php
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• [F] HttpFactory.php
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• [F] InflateStream.php
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• [F] LazyOpenStream.php
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• [F] LimitStream.php
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• [F] Message.php
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• [F] MessageTrait.php
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• [F] MimeType.php
  Delete
• [F] MultipartStream.php
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• [F] NoSeekStream.php
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• [F] PumpStream.php
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• [F] Query.php
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• [F] Request.php
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• [F] Response.php
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• [F] Rfc7230.php
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• [F] ServerRequest.php
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• [F] Stream.php
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• [F] StreamDecoratorTrait.php
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• [F] StreamWrapper.php
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• [F] UploadedFile.php
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• [F] Uri.php
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• [F] UriComparator.php
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• [F] UriNormalizer.php
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• [F] UriResolver.php
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• [F] Utils.php
  Delete

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Enhancing Payment Security: The Role of Encryption and Tokenization in Digital Transactions

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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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• Payment