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1

Yep it's possible depending on what you want to cache. I've done a similar thing to cache the main loop on our homepage. Essentially you can use the posts_request and posts_results to hijack the query and hit the cache instead then also use found_posts to correct the pagination. Really rough example pulled from our code (untested) but you should help you ...


2

It will be made possible in 4.6 (assuming no changes till release) with the new posts_pre_query filter https://core.trac.wordpress.org/ticket/36687


9

At the moment, it is not possible. When 'pre_get_posts' runs, is too late to stop WP_Query to perform a query. WordPress itself, when you try to query a taxonomy that does not exists, adds AND (0 = 1) to the WHERE clause of the SQL query, to ensure it returns no results very quickly... There's a trac ticket with a patch that will probably lands in core ...


2

This is PHP question more than a WordPress question. As @Mark commented: returning from the action do not return by magic from the calling function That is true. Placing return in function mean exit the function and placing return in a PHP file mean exit the file. Do not get confused with PHP construct exit() :P (You might find a better answer on SO ...



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