I'm using posts_where filter in order to modify the user searches on a web, but i find out that some default widgets like the "more recent posts" uses this filter too and their behaviour are also modified. I am trying to find a way to avoid that anything other than the users searches use the posts_where filter.

This is my code:

add_filter( 'posts_where' , 'posts_where_statement' );

function posts_where_statement( $where ) {
   global $wp_query;
   global $expp;
   global $wpdb;
   $local_db = $wpdb->prefix."posts";
   $front_page_id = get_option('page_on_front');

   if ( ('page' != get_option('show_on_front') || $front_page_id != $wp_query->query_vars['page_id']) && (!($wp_query->is_search)) )
       return $where;

   //some $where modifications

   remove_all_actions ( '__after_loop');
   return $where;

Is there any other function or a way to make this hook/filter only work with the search query? (the one that fetches the results from the user input)


1 Answer 1



The problem with your current snippet is that you are just checking the global main query object, no matter what the current query object is.


Note that the second input argument for the posts_where filter callback, is the current query object.

Use that to determine if it's the main search query on the front-end with:

add_filter( 'posts_where', function ( $where, \WP_Query $q ) 
    if( ! is_admin() && $q->is_main_query() && $q->is_search()) // No global $wp_query here
        // ... your modifications

    return $where;      

}, 10, 2 ); // Note the priority 10 and number of input arguments is 2

There's also the posts_search filter for the WHERE search part, if that's what you need to modify.

But in general I would say only modify the generated SQL by hand if, you really must and have no other alternatives.

  • +1 for type hinting. Not a fan of $q though. Jan 13, 2017 at 16:09
  • 1
    thanks, It would be nice to have an interface. yes it's a valid point regarding the variable name. I must admit that the code scrollbars on this site, affects how I write answers - I try to avoid them ;-) Some use $wp_query but that could be confused with the global $wp_query, other use $qry or $query, but that might also be confusing when we're dealing with SQL query ;-) I settled for $q in this short snippet and it also looks simpler than e.g. $wp_query_obj.Usually I take the multiple if-contidtions into a seperate line @MichaelEcklund
    – birgire
    Jan 13, 2017 at 16:44
  • what does \WP_Query $q mean? I mean why the slash?
    – brett
    Mar 28, 2018 at 17:51
  • @brett If we use a namespace in our plugin, then we need this for WordPress classes, as WordPress uses the global space.
    – birgire
    Mar 28, 2018 at 22:35

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