override defaults using envvars when present

Author: mikelduke

src/phpGPS_Settings.php

@@ -1,9 +1,11 @@
 <?php
 
-  ini_set('display_errors',1);  
-  error_reporting(E_ALL);
+  // enable for development only
+  // ini_set('display_errors',1);  
+  // error_reporting(E_ALL);
 
   class phpGPS_Settings {
+
     //Map Info
     public static $_defaultZoom = 3;
     public static $_defaultCenterLat = "41.988308";
@@ -32,5 +34,28 @@ class phpGPS_Settings {
 
     //Secret key for adding an entry using addGpsEntry.php
     public static $_secretKey = "1234";
+
+
+    // override defaults from environment variables if defined
+    static function init() {
+      phpGPS_Settings::$_host     = phpGPS_Settings::loadFromEnv("db_hostname", phpGPS_Settings::$_host);
+      phpGPS_Settings::$_username = phpGPS_Settings::loadFromEnv("db_username", phpGPS_Settings::$_username);
+      phpGPS_Settings::$_password = phpGPS_Settings::loadFromEnv("db_password", phpGPS_Settings::$_password);
+      phpGPS_Settings::$_dbname   = phpGPS_Settings::loadFromEnv("db_name",     phpGPS_Settings::$_dbname);
+
+      phpGPS_Settings::$_devKey   = phpGPS_Settings::loadFromEnv("dev_key", phpGPS_Settings::$_devKey);
+
+      phpGPS_Settings::$_secretKey = phpGPS_Settings::loadFromEnv("secret_key", phpGPS_Settings::$_secretKey);
+    }
+
+    private static function loadFromEnv($name, $default) {
+      if (isset($_ENV[$name])) {
+        return $_ENV[$name];
+      } else {
+        return $default;
+      }
+    }
   }
+
+  phpGPS_Settings::init();
 ?>