codemascot

<?php

add_action( 'pre_get_posts', 'the_dramatist_filter_pre_get_posts' );
function the_dramatist_filter_pre_get_posts( $query ) {

	if( is_admin() && $query->is_main_query() && in_array( $query->get('post_type'), array('shop_order') ) ) {
		add_filter( 'posts_join', 'the_dramatist_filter_pre_get_posts_query_join' );
		add_filter( 'posts_where', 'the_dramatist_filter_pre_get_posts_filter_date' );
	}
}

mariusvetrici

<?php
add_action( 'restrict_manage_posts', 'admin_posts_filter_restrict_manage_posts_by_author' );
/**
 * Create the drop down
 *
 * @return void
 */
function admin_posts_filter_restrict_manage_posts_by_author(){
	if (isset($_GET['post_type']) && 'task' == $_GET['post_type']){
		wp_dropdown_users( array(

westonruter

<?php
/**
 * How to filter the value that would be returned by get_post_thumbnail_id()
 */

add_filter( 'get_post_metadata', function ( $value, $post_id, $meta_key, $single ) {
	// We want to pass the actual _thumbnail_id into the filter, so requires recursion
	static $is_recursing = false;

	// Only filter if we're not recursing and if it is a post thumbnail ID