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I'd like to be able to hook into WP_Query in such a way that I can add a custom argument to my WP_Query like:

$q = new WP_Query([
  'my_cool_arg' => [ 1, 2, 3 ]
]);

and then access this and modify the where part of the generated SQL query. I am aware of the posts_where filter, but I don't know how to access the arguments from that filter.

2
  • What exactly should this custom argument do – Pieter Goosen Sep 10 '15 at 13:17
  • I'm interested in a general solution to the problem. But as an example let's say I want to append an EXISTS statement to the WHERE clause that queries a custom table in the database using an IN generated from the array I provided. Generating the SQL isn't a problem for me, I just need to find a way to access the argument while modifying the query. – Nocklas Sep 10 '15 at 14:15
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Solved it. The filter posts_where takes the query object as a second parameter.

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