Please add below code to "functions.php" for generating the query string:
function add_query_vars($aVars) { $aVars[] = "mode"; return $aVars; } add_filter('query_vars', 'add_query_vars'); function add_rewrite_rules($aRules) { $aNewRules = array('news/([^/]+)/?$' => 'index.php?pagename=news&mode=$matches[1]'); $aRules = $aNewRules + $aRules; return $aRules; } add_filter('rewrite_rules_array', 'add_rewrite_rules'); function wp_redirect_to_homepage( $query ) { if ( $query->is_main_query() && ( $query->query_vars['pagename'] == 'news') ){ if( ( array_key_exists( 'mode', $query->query_vars ) && (trim($query->query_vars['mode']) != 'follow' && trim($query->query_vars['mode']) != 'like'))) { wp_redirect( get_permalink($query->queried_object_id) ); exit; } } } add_action( 'parse_query', 'wp_redirect_to_homepage' );
Also you can see below URL:
http://stackoverflow.com/questions/14669336/redirect-if-wordpress-query-string-is-empty
Its very good example for rewrite query string.
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