How to intercept $_GET and modify it before search happen?

  • I’m trying to create an advanced search page (with dropdowns and checkboxes). The only issue I’m having is that I cannot get more than one checkbox value to be sent to the search… so I figure that I can fix this by passing the values in the checkboxes via an array (which I do have working) but I need to intercept those values and modify them for the $_GET call to the search page BEFORE the search happens.

    How do I do this? All of the stuff I’ve found simply does things AFTER the search takes place:
    – calling a function on the action wp_head
    – adding a filter pre_get_posts (not sure why this one isn’t working for me, seems like it should)

    Any suggestions?

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