Show Post if Search Returns One Result

functions.php

<?php
function single_result() {
	if ( is_search() ) {
		global $wp_query;
		if ( $wp_query -> post_count == 1 && $wp_query -> max_num_pages == 1 ) {
			wp_redirect( get_permalink( $wp_query -> posts[ 0 ] -> ID ) );
			exit;
		}
	}
}
add_action( 'template_redirect', 'single_result' );
?>

Few things in life (okay, I exaggerate) are more annoying than searching for something, getting one result and you still have to click it to view it - this rectifies that. Simply add to your theme's functions.php.

Thanks to my fellow Automattician Kailey [for the original code](https://trepmal.com/2011/04/22/redirect-when-search-query-only-returns-one-match/).