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

I am trying to connect cloud sql socket with google cloud app engine flexible.

My code is 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";  }

app.yaml

runtime: php
env: flex

runtime_config:
    document_root: .

env_variables:
    MYSQL_DSN: mysql:dbname=DATABASE;unix_socket=/cloudsql/CONNECTION_NAME
    MYSQL_USER: username
    MYSQL_PASSWORD: password

Getting bellow error

SQLSTATE[HY000] [2002] No such file or directory

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