Search only post type in wordpress

By default wordpress search provides a searching function on whole site whether it is pages or post type. In order to make the search only post type in wordpress, below is the code you need to copy and paste it in to your function.php file.

function filter_search($query) {
if ($query->is_search) {
$query->set('post_type', array('post','page'));
};
return $query;
};
add_filter('pre_get_posts', 'filter_search');

Notice the line that says

$query->set('post_type',array('post','page'));

We can filter the search results by changing the values in the array variable. Right now it is set to display posts and pages but you can modify it to display anything we required.