db fixes to make v4.0.0 run on MAMP

wp-content/db.php

@@ -10,9 +10,9 @@
 function test_localhosts( ) {
   /* DB URL is set with SetEnv in Apache https://github.com/mhoofman/wordpress-heroku#linux-or-manual-apache-config */
 
- if (preg_match('/localhost/',$_SERVER['DATABASE_URL'])) {
+  if (preg_match('/localhost/',$_ENV['DATABASE_URL'])) {
     preg_match('/(.*)\/wp-.*\/(\w*\.php)+$/', $_SERVER['REQUEST_URI'], $path);
-   return ("http://" . $_SERVER['SERVER_ADDR'] . $path[1]);
+    return ("http://" . $_SERVER['HTTP_HOST'] . $path[1]);
   }
 
   else return false; // act as normal; will pull main site info from db
@@ -43,6 +43,10 @@ function test_localhosts( ) {
 // change this to true
 define( 'PG4WP_INSECURE', false);
 
+/** use ext mysql needs to be set when running with MAMP */
+if(test_localhosts())
+  define('WP_USE_EXT_MYSQL', true);
+
 // This defines the directory where PG4WP files are loaded from
 //   2 places checked : wp-content and wp-content/plugins
 if( file_exists( ABSPATH.'/wp-content/pg4wp'))