Change Searchform placeholder

/**
* Change Searchform placeholder

*/
function wp_search_form( $form ) { $form = '

<section class="search search-form"><form role="search" action="' . home_url( '/' ) . '" method="get"><label class="screen-reader-text" for="s">' . __('', 'domain') . '</label> <input id="s" class="search-field" name="s" type="search" value="' . get_search_query() . '" placeholder="" /> <input id="searchsubmit" class="search-submit" type="submit" value="'. esc_attr__('Go', 'domain') .'" /></form></section>'; return $form; }

add_filter( 'get_search_form', 'wp_search_form' );