[WordPress] Display the most recently executed WordPress query.

00-display-last-wordpress-query.php

<?php 

add_filter( 'posts_request', '_acme_view_query' );
/**
 * This is a private function used for debugging purposes. It dumps the 
 * query that was just executed out to the top of the page.
 *
 * @since 1.0.0
 *
 * @param     string $query    The query that was just executed.
 * @return    string $query    The query that was just executed, if we're on the search template.
 */
function _acme_view_query( $query ) {

	if ( is_admin() && is_search() && isset( $_GET['view_query'] ) && 'true' === $_GET['view_query'] ) {
		var_dump( $query );
	}

	return $query;

}

01-query-string-variable.php

<?php

/** 
 * If the 'view_query' query string is set and has the value of 'true'
 * then let's trigger the hook. 
 */
if ( isset( $_GET['view_query'] ) && 'true' === $_GET['vew_query'] ) {
  add_filter( 'posts_request', '_acme_view_query' );
}