automattic / cheeztest Goto Github PK
View Code? Open in Web Editor NEWAdding some LOLs to your server-side WordPress A/B testing. Plays nice with Batcache.
License: MIT License
cheeztest's Introduction
______ __ ________ __ / \ / | / | / | /$$$$$$ |$$ |____ ________$$$$$$$$/_______ _$$ |_ $$ | $$/ $$ \ / | $$ | / |/ $$ | $$ | $$$$$$$ |$$$$$$$$/ $$ |/$$$$$$$/ $$$$$$/ $$ | __ $$ | $$ | / $$/ $$ |$$ \ $$ | __ $$ \__/ |$$ | $$ | /$$$$/__ $$ | $$$$$$ | $$ |/ | $$ $$/ $$ | $$ |/$$ | $$ |/ $$/ $$ $$/ $$$$$$/ $$/ $$/ $$$$$$$$/ $$/ $$$$$$$/ $$$$/ CheezTest lets you create and run Batcache-compatible server-side A/B tests in your theme. A joint LOL by the fine folks I Can Has Cheezburger (http://www.cheezburger.com) and Automattic (http://automattic.com) Main class from which all A/B tests are inherited. Enables fast setup of A/B tests - upon initialization, the basic order of execution is: set test name > check if user is qualified to participate > check if user has been assigned a segment, and assign if not > assign user to group > execute 'action' callback if present. User's qualification, segment, and group tests are done in batcache so as to ensure correct cache variants are served. User's segment is assigned server-side via magic. Mutliple test segments are assigned at once - so if a user is qualified to participate in more than one test, all segments are assigned at the same time. When segments need to be set, a small javascript is injected into the <head> via a call to CheezTest::write_segment_cookie(). This javascript sets a cookie to retain the segment assigned earlier. Test case data (name, is_qualified, & group) are stored in the $active_tests static hash and made accessible via the 'is_qualified_for', 'get_group_for', and 'is_in_group' static methods. This enables theme branching via: if ( CheezTest::is_qualified_for( 'my-example-test' ) { //test-specific stuff goes here } - or - if ( CheezTest::is_in_group( 'my-example-test', 'my-example-group' ) ) { //group-specific stuff goes here } The plugin makes use of Batcache’s support for vary_cache_on_function, which saves page variants in a page’s cache and then evaluates which one to serve when the page loads. IMPORTANT: Since the tests run before Batcache, which in turn runs very early (before theme code is included), only built-in PHP functions and jetpack_is_mobile() can be used when defining tests. Any theme-specific functions will not be available.
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cheeztest's Issues
run_user_segmentation runs after analytics JS
Because you're hooking CheezTest::run_user_segmentation() into 'wp_head' instead of 'wp_enqueue_scripts', the user segmentation JS is printed after all the JS that's enqueued with the standard WordPress api.
First of all, seems like a waste to start downloading and running a bunch of external scripts and THEN reload the page.
Second of all, on our site it ended up causing an artificial doubling of pageviews in Google Analytics. For each new users, all of our analytics JS would run, then the cheeztest segmentation would assign a cookie and reload the page. Analytics would run again.
We solved this by removing the action from wp_head and manually calling it right before our analytics JS.
I am curious if this was a conscious decision or just an oversight? Or am I missing a good reason to keep the segmentation JS at the bottom of the head?
Cheers,
-Ben
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