http.php
protected function createSocket($scheme, $host, $port, $timeout)
    {
        if (in_array($scheme, array('file'))) {
            return new SimpleFileSocket($this->url);
        } elseif (in_array($scheme, array('https'))) {
            return new SimpleSecureSocket($host, $port, $timeout);
        } else {
            return new SimpleSocket($host, $port, $timeout);
        }
    }
protected function createSocket($scheme, $host, $port, $timeout)
    {
        if (in_array($scheme, array('file'))) {
            return new SimpleFileSocket($this->url);
        } elseif (in_array($scheme, array('https'))) {
            return new SimpleSecureSocket($host, $port, $timeout);
        } else {
            return new SimpleSocket($host, $port, $timeout);
        }
    }
Factory for socket.

@param string $scheme                   Protocol to use.
@param string $host                     Hostname to connect to.
@param int $port                    Remote port.
@param int $timeout                 Connection timeout.

@return SimpleSocket/SimpleSecureSocket New socket.