Google App Engine Cloud SQL connection issue - google-app-engine

Question

When trying to connect to Google Cloud SQL I get following error:
Connection error
Unable to find the socket transport "unix" - did you forget to enable it when you configured PHP?
I have been trying to solve this issue now for multiple hours, still nothing.
My config is as follows (in ZF2 config local.php):
return array(
'db' => array(
'driver' => 'Mysqli',
'host' => '',
'database' => 'ar_captab',
'username' => 'root',
'password' => '',
'driver_options' => [
'unix_socket' => ':/cloudsql/some-app-v1-test:some-db'
]
),
);
I also added my application ID of my Google App Engine application to Access Control list (Authorized App Engine Applications) in Cloud SQL.
When I try to run this:
$config = $this->getServiceLocator()->get('config');
$adapter = new \Zend\Db\Adapter\Adapter($config['db']);
$sql = new \Zend\Db\Sql\Sql($adapter);
$select = $sql->select();
$select->from('example');
$select->where('1');
$statement = $sql->prepareStatementForSqlObject($select);
$results = $statement->execute();
I get the unix socket error. What I am missing?

Answer 1

Finally figured it out. I was because of the colon. You do not need it with Mysqli connection, only with PDO connection types.
So the correct config is:
return array(
'db' => array(
'driver' => 'Mysqli',
'host' => '',
'database' => 'some-database',
'username' => 'root',
'password' => '',
'driver_options' => [
'unix_socket' => '/cloudsql/some-app-v1-test:some-db'
]
),
);