How to set filters to limit search results

Here’s how you can generate the links:

$query_string = $_SERVER['QUERY_STRING'];
$posts_10     = add_query_arg( 'posts_per_page', 10, $query_string );
$posts_20     = add_query_arg( 'posts_per_page', 20, $query_string );
$posts_30     = add_query_arg( 'posts_per_page', 30, $query_string );

thanks for this. But how to make a link?

<a href="<?php echo $posts_10;">Show 10 posts</a>
<a href="<?php echo $posts_20;">Show 20 posts</a>
<a href="<?php echo $posts_30;">Show 30 posts</a>

• This reply was modified 5 years, 8 months ago by Mikko Saari.

Already tried that. It adds the query string in my url like below:
https://localhost/project/?s=contact&posts_per_page=3

But it cannot limit the search results. Here is my complete code:

<?php

/// Calling Custom Search Form ///
		add_filter( 'get_search_form', 'custom_search_form_2' );
		get_search_form();
		remove_filter( 'get_search_form', 'custom_search_form_2' );
if(have_posts()):		
					/// Calling Custom Search Form ///
		add_filter( 'get_search_form', 'custom_search_form_2' );
		get_search_form();
		remove_filter( 'get_search_form', 'custom_search_form_2' );
		
		/// Filteration ////
$query_string = $_SERVER['QUERY_STRING']."<br>";

$posts_10     = add_query_arg( 'posts_per_page', 3, $query_string );
$posts_20     = add_query_arg( 'posts_per_page', 20, $query_string );
$posts_30     = add_query_arg( 'posts_per_page', 30, $query_string );
?>

<a href="<?php echo '?'.$posts_10;?>">Show 10 posts</a>

<?php 
while(have_posts()): 
the_post();
?>

Kindly guide what is the mistake because it cannot filter the number of results when I use the filtering link.

Thanks

The problem is not in your code, but in WordPress. I’m pretty sure WP accepted the posts_per_page parameter before, but it doesn’t anymore. This is something I can fix in the next version of Relevanssi, but meanwhile you can add this to your theme functions.php:

add_filter( 'query_vars', 'rlv_query_vars' );
function rlv_query_vars( $qv ) {
	$qv[] = 'posts_per_page';

	return $qv;
}

Once you add this, the parameter will start working.

oh great thanks a lot for this help.

thanks again