Change Name of Wordpress Search Form

functions.php

/**
* Change the name of the search form from s to fwp_resource_search
*/

function my_query_vars( $public_query_vars ) {
    if ( isset( $_GET['fwp_resource_search'] ) && ! empty( $_GET['fwp_resource_search'] ) ) {
        $_GET['s'] = $_GET['fwp_resource_search'];
    }
    return $public_query_vars;
}

add_filter( 'query_vars', 'my_query_vars' );