Views Contextual Filter Default Value Function

Declare custom functions to pick contextual filter default values, easily.

Creating ctools plugins is an undue barrier to controlling contextual filter default values. This is a common site scenario that increases the power of Views. Also creating a very focused function to find a value helps keep concerns separate and improves testability.

Register your custom function via info hook.

function mymodule_views_contextual_filter_function_info() {
  return (object) array(
    'label' => 'Get some magical filter value',
    'function' => 'mymodule_get_value_somehow',
  );
}