Custom Search Results Subheading

custom-search-results-subheading.php

<?php
// Custom Search Results Subheading
add_filter( 'custom_search_results_subheading', function( $subheading ) {
	if ( is_search() ) {
		global $wp_query;
		$posts_per_page = $wp_query->query_vars['posts_per_page'];
		$posts_found    = $wp_query->found_posts;
		if ( $posts_found ) {
			$subheading = sprintf(
				esc_html__( 'Displaying results 1-%1$s out of %2$s for %3$s', 'total' ),
				$posts_per_page,
				$posts_found,
				get_search_query( false )
			);
		}
	}
	return $subheading;
} );

?>

//Use:
<?php global $wp_query; echo $wp_query->found_posts.' results found.'; ?>