How To Get Search Term and Use in Function

You’re adding a filter to get_search_query, and within that function calling get_search_query, which runs your filter, which calls get_search_query, which runs your filter, which calls get_search_query, which runs your filter… do you see the problem here?

The search query is passed to the filter as an argument, so you don’t need to fetch it-

function myFunction($search_term){
    // now you can use $search_term directly in your code
}
add_filter('get_search_query','myFunction');