Call db in a normal function

2

@HieuTruong You would want to create a container for your database connection and pass that object in as the function parameter rather than app:

$c = $app->getContainer();

$c['db'] = function() {
	return new DB($host,$user,$pass,$name);
};

$app->post('/search/[{phone}]', function($request, $response, $args) use ($c) {
	$token = $request->getParam('token');
	$phone = $args['phone'];

	if (isTokenValid($c->db, $token)){
		return $response->withJson("valid");
	}
	return $response->withJson("invalid");

});


function isTokenValid($db, $token){
	$sql = 'SELECT id FROM users WHERE token = :token';
	$s = $db->prepare($sql);
	$s->bindParam(':token', $token);
	if ($s->execute()){
	    if($sth->rowCount() > 0){
	        return true;
	    }
	}
	return false;
}

Containers help make your own code reusable, testable and independent from the Slim app object.

Also, rather than $this->response, you can just use $response.

https://www.slimframework.com/docs/concepts/di.html