protected function providerExists($provider)
    {
        return (
            array_key_exists($provider, $this->serviceMap) ||
            array_key_exists($provider, $this->config)
        );
    }
protected function providerExists($provider)
    {
        return (
            array_key_exists($provider, $this->serviceMap) ||
            array_key_exists($provider, $this->config)
        );
    }
protected function providerExists ( $ provider ) { return ( array_key_exists ( $ provider , $ this -> serviceMap ) || array_key_exists ( $ provider , $ this -> config ) ) ; }
Determine whether the provider exists in the service map as well as the social login config

@param  string $provider
@return bool
Determine whether the provider exists in the service map as well as the social login config