title: GAE PHP won't connect to Cloud SQL
body: <p>Can't seem to get GAE PHP to connect to Cloud SQL, using mysqli, says: Unable to find the socket transport "unix" - did you forget to enable it when you configured PHP?</p>
  
  <p>I've authorized the app and made sure they're both in the same region i.e US</p>
  
  <p>any ideas would be great, thanks</p>
  
  <pre><code>$mysqli = new mysqli(null, "USERNAME", "PASSWORD", "DATABASE", null,
  "/cloudsql/PROJECT_NAME:db2");
  </code></pre>
  
  <p>when i use :/cloudsql/PROJECT_NAME:db2 it's saying there's error with 'sock'</p>
  
  <p>When i use /cloudsql/PROJECT_NAME:db2 without : it's saying cannot connect to user@localhost</p>