Here’s another object-oriented mu-plugin that you can expand upon if needed. This adds the option to perform a search with “&search__only_titles” or “&search__only_content” in the url to search only titles or content of posts.

[code language=”php”]
<?php

class rdc_search_object {

function __construct() {
add_filter( ‘posts_search’, ‘filter__posts_search’ );
}

function filter__posts_search( $query ) {
$query_parts = explode( ‘ OR ‘, $query );

if ( isset( $_GET[‘search__only_titles’] ) )
return $query_parts[0] . ‘))’;

if ( isset( $_GET[‘search__only_content’] ) )
return ‘ AND ((‘ . $query_parts[1];

return $query;
}

}

$rdc_search_object = new rdc_search_object();

// omit[/code]

Go ahead and use this juicy tidbit and let me know in the comments what creative use you found for it.