src/Valkyrja/HttpMessage/NativeStream.php
public function getMetadata(string $key = null)
    {
        // If no key was specified
        if (null === $key) {
            // Return all the meta data
            return stream_get_meta_data($this->stream);
        }

        // Get the meta data
        $metadata = stream_get_meta_data($this->stream);

        return $metadata[$key] ?? null;
    }
public function getMetadata(string $key = null)
    {
        // If no key was specified
        if (null === $key) {
            // Return all the meta data
            return stream_get_meta_data($this->stream);
        }

        // Get the meta data
        $metadata = stream_get_meta_data($this->stream);

        return $metadata[$key] ?? null;
    }
Get stream metadata as an associative array or retrieve a specific key.

The keys returned are identical to the keys returned from PHP's
stream_get_meta_data() function.

@link http://php.net/manual/en/function.stream-get-meta-data.php

@param string $key Specific metadata to retrieve.

@return array|mixed|null Returns an associative array if no key is
provided. Returns a specific key value if a key is provided
and the value is found, or null if the key is not found.