Get custom search form

search.php

<?php

//MORUS SEARCH
function morus_search_form() {
    $home_url = esc_url( get_home_url( '/' ) );
    $value = esc_attr( get_search_query() );
    $lable = __( 'Search', 'morus' );
    $form = <<<FORM
    <form action="{$home_url}" method="GET">
        <input name="s" value="{$value}" type="text" placeholder="{$lable}" class="form-control" id="search_input">
        <button type="submit" class="search_icon"><i class="ion-ios-search-strong"></i></button>
    </form>
FORM;
    return $form;
}

add_action( 'get_search_form', 'morus_search_form' );