w3tc_module_is_running-cdn, array( $this, cdn_is_running

Warning: Undefined array key 0 in /home/c6974294/public_html/wp-plugin-api.com/wp-content/themes/wordpress-hooks/functions.php on line 33

Warning: Attempt to read property "name" on null in /home/c6974294/public_html/wp-plugin-api.com/wp-content/themes/wordpress-hooks/functions.php on line 33
See hook in action

See this hook used in plugins:

Select Pluginw3-total-cache.2.10.3