[google-cloud-sql-discuss] SQLSTATE[HY000] [2002] No such file or directory, google app engine flexible

Using cloud sql with app engine flexible. Trying to connect sql with socket as bellow:

   

   $dsn = getenv('MYSQL_DSN');

   $user = getenv('MYSQL_USER');

   $password = getenv('MYSQL_PASSWORD');

   try {

       $db = new PDO($dsn, $user, $password);

       $statement = $db->prepare("SELECT * from user");

       $statement->execute();

       $users = $statement->fetchAll();

   } catch (Exception $e) {

       echo 'Caught exception: ',  $e->getMessage(), "\n";

   }

My app.yaml file

    runtime: php

    env: flex

    runtime_config:

        document_root: .

    env_variables:

        MYSQL_DSN: mysql:dbname=DATABASE;unix_socket=/cloudsql/INSTANCE_CONNECTION_NAME

        MYSQL_USER: username

        MYSQL_PASSWORD: password

I am getting bellow error:

Caught exception: SQLSTATE[HY000] [2002] No such file or directory

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