-// Set this variable to true if you want to use environment variables for mysql
-$db_use_env_vars = false;
-if ($db_use_env_vars) {
+// Use environment variables for mysql if they are set beforehand
+if (!empty(getenv('MYSQL_HOST'))
+ && !empty(getenv('MYSQL_PORT'))
+ && !empty(getenv('MYSQL_USERNAME'))
+ && !empty(getenv('MYSQL_PASSWORD'))
+ && !empty(getenv('MYSQL_DATABASE'))) {