Fix prefix issue with multiple installs

app/Plugin.php

@@ -167,6 +167,22 @@ private function verify_dependencies( $die = false, $activate = false ) {
 
   }
 
+  /**
+    * Append a field prefix as defined in $config
+    *
+    * @param string $field_name The string/field to prefix
+    * @param string $before String to add before the prefix
+    * @param string $after String to add after the prefix
+    * @return string Prefixed string/field value
+    * @since 0.1.0
+    */
+  public static function prefix( $field_name = null, $before = '', $after = '_' ) {
+
+    $prefix = $before . self::$config->get( 'prefix' ) . $after;
+    return $field_name !== null ? $prefix . $field_name : $prefix;
+
+  }
+
   /**
     * Get Carbon Fields option, with object caching (if available). Currently
     *   only supports plugin options because meta fields would need to have the

composer.json

@@ -22,7 +22,7 @@
     "jjgrainger/posttypes": "^2.0.1",
     "tgmpa/tgm-plugin-activation": "^2.6.1",
     "tareq1988/wordpress-settings-api-class": "dev-master",
-    "dmhendricks/wordpress-toolkit": "0.4.0",
+    "dmhendricks/wordpress-toolkit": "^0.4.1",
     "underdev/requirements": "^1.3",
     "inc2734/wp-customizer-framework": "3.2.3",
     "composer/installers": "^1.0.6"