Reference

Serialization

String

At times, it's useful to either create a string representation of a message (serialization), or to cast a string or stream message to an object (deserialization). This package provides features for this in Zend\Diactoros\Request\Serializer and Zend\Diactoros\Response\Serializer; each provides the following static methods:

• fromString($message) will create either a Request or Response instance (based on the serializer used) from the string message.
• fromStream(Psr\Http\Message\StreamInterface $stream) will create either a Request or Response instance (based on the serializer used) from the provided stream.
• toString(Psr\Http\Message\RequestInterface|Psr\Http\Message\ResponseInterface $message) will create either a string from the provided message.

The deserialization methods (from*()) will raise exceptions if errors occur while parsing the message. The serialization methods (toString()) will raise exceptions if required data for serialization is not present in the message instance.

Array

This package also provides features for array serialization using Zend\Diactoros\Request\ArraySerializer and Zend\Diactoros\Response\ArraySerializer; each provides the following static methods:

• fromArray(array $message) will create either a Request or Response instance (based on the serializer used) from the array message.
• toArray(Psr\Http\Message\RequestInterface|Psr\Http\Message\ResponseInterface $message) will create an array from the provided message.

The deserialization methods (fromArray()) will raise exceptions if errors occur while parsing the message.

Example Usage

Array serialization can be usesful for log messages:

class LoggerMiddleware
{
    /**
     * @var \Psr\Log\LoggerInterface
     */
    protected $logger;

    public function __invoke(ServerRequestInterface $request, ResponseInterface $response, callable $next)
    {
        $response = $next($request, $response);

        $this->logger->debug('Request/Response', [
            'request' => \Zend\Diactoros\Request\ArraySerializer::toArray($request),
            'response' => \Zend\Diactoros\Response\ArraySerializer::toArray($response),
        ]);

        return $response;
    }
}