Stream::__construct( resource $body )

34    public function __construct($body)35    {36        if (!\is_resource($body)) {37            throw new \InvalidArgumentException('First argument to Stream::__construct() must be resource');38        }39        $this->stream = $body;40        $meta = \stream_get_meta_data($this->stream);41        $this->seekable = $meta['seekable'] && 0 === \fseek($this->stream, 0, \SEEK_CUR);42        $this->readable = isset(self::READ_WRITE_HASH['read'][$meta['mode']]);43        $this->writable = isset(self::READ_WRITE_HASH['write'][$meta['mode']]);44    }