WordPress Search Functions

wordpress-search-functions.php

<?php
/**
 * Exclude posts by ID
 *
 * @param array $query The WP_Query instance.
 */
function exclude_posts_from_search( $query ) {
	if ( $query->is_main_query() && is_search() ) {
		// Add post IDs into array.
		$post_ids = array( 10, 11, 12 ); 
		$query->set( 'post__not_in', $post_ids );
	}
}
add_action( 'pre_get_posts', 'exclude_posts_from_search' );

/**
 * Auto-redirect when Search Query only returns one match
 * Ensure we don't activate on the last page of results with only one entry by checking `paged`
 */
function one_match_redirect() {
	if ( is_search() ) {
		global $wp_query;
		if ( 1 === $wp_query->post_count && 0 === get_query_var( 'paged' ) ) {
			wp_safe_redirect( get_permalink( $wp_query->posts['0']->ID ) );
			exit();
		}
	}
}
add_action( 'template_redirect', 'one_match_redirect' );