friendly URL for WordPress search (/search/term/) – insert into functions.php

nice_search

function roots_nice_search_redirect() {
	global $wp_rewrite;
	if (!isset($wp_rewrite) || !is_object($wp_rewrite) || !$wp_rewrite->using_permalinks()) {
		return;
	}
	$search_base = $wp_rewrite->search_base;
	if (is_search() && !is_admin() && strpos($_SERVER['REQUEST_URI'], "/{$search_base}/") === false) {
		wp_redirect(home_url("/{$search_base}/" . urlencode(get_query_var('s'))));
		exit();
	}
}

if ( current_theme_supports('nice-search') ) {
	add_action( 'template_redirect', 'roots_nice_search_redirect' );
}

function change_search_url_rewrite() {
	if ( is_search() && ! empty( $_GET['s'] ) ) {
		wp_redirect( home_url( "/search/" ) . urlencode( get_query_var( 's' ) ) );
		exit();
	}	
}

add_action( 'template_redirect', 'change_search_url_rewrite' );