apply_filters_ref_array( ‘posts_where’, string $where, WP_Query $query )

Filters the WHERE clause of the query.


The WHERE clause of the query.
The WP_Query instance (passed by reference).

More Information

  • This filter applies to the posts where clause and allows you to restrict which posts will show up in various areas of the site. Combined with restrict_manage_posts it allows you to only show posts matching specific conditions.

    Here is an example to match the restrict_manage_posts example:

add_filter( 'posts_where' , 'posts_where' );

function posts_where( $where ) {

if( is_admin() ) {
global $wpdb;

if ( isset( $_GET['author_restrict_posts'] ) && !empty( $_GET['author_restrict_posts'] ) && intval( $_GET['author_restrict_posts'] ) != 0 ) {
$author = intval( $_GET['author_restrict_posts'] );

$where .= " AND ID IN (SELECT object_id FROM {$wpdb->term_relationships} WHERE term_taxonomy_id=$author )";
return $where;

Depending on setup, if we had a custom post type of type ‘book’ with a taxonomy (category style) of type ‘author’, this filter would allow us to only show books written by a specific author.

  • Certain functions which retrieve posts do not run filters, so the posts_where filter functions you attach will not modify the query. To overcome this, set suppress_filters to false in the argument array passed to the function. The following code sample illustrates this.

  • //some function that modifies the query
    function useless_condition ( $where ) { return $where . ' AND 1=1 '; }
    //attach your function to the posts_where filter
    add_filter( 'posts_where' , 'useless_condition' );
    //get posts AND make sure filters are NOT suppressed
    $posts = get_posts( array( 'suppress_filters' => FALSE ) );


    $where = apply_filters_ref_array( 'posts_where', array( $where, &$this ) );



    User Contributed Notes

    1. Skip to note 2 content

      Please note that the post_type query variable is not set for standard types (page, post and attachment, see WP_QUery class file line 2396 on trac), only for custom post types, so this is how you can test for each type,

          add_filter( 'posts_where' , 'posts_where', 10, 2);
          function posts_where( $args, $wp_query_obj ) {
            $type = $wp_query_obj->query_vars['post_type'];
              case 'any'==$type: //query any type (see codex for more details).
              case !empty($type) && is_array($type):
                //multiple post types define
              case !empty($type):
                //post type is a custom post.
              case $wp_query_obj->is_attachment():
                //post type is empty but is a media.
              case $wp_query_obj->is_page():
                //post type is empty but is a page.
                //post type is empty and not an attachment nor a page, so is a post.
            return $where;

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