pagecache_page_key, array( W3TCExtension_Amp_Plugin, pagecache_page_key pagecache_page_key, array( W3TCExtension_Amp_Plugin, pagecache_page_key Share this:TweetLike this:Like Loading… Hook Type: actionSee hook in action See this hook used in plugins:Select Pluginw3-total-cache.2.10.3