AkanoCA

add_filter( 'get_search_form', 'my_search_form' ); 
function my_search_form( $form ) {

    $form = '
	<form role="search" method="get" id="searchform" action="' . home_url( '/' ) . '" >
		<label class="screen-reader-text" for="s">Запрос для поиска:</label>
		<input type="text" value="' . get_search_query() . '" name="s" id="s" />
		<input type="submit" id="searchsubmit" value="Найти" />
	</form>';

    return $form;
}