How To Make Your Search Results Unlimited In WordPress

Putting the following snippet in your theme’s search.php, you will be able to do so. Start by finding the below code in your search.php file:

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

1 2	<?php if (have_posts()) : ?> <?php while (have_posts()) : the_post(); ?>

Once you found it, simply replace it with:

<?php $posts=query_posts($query_string . '&posts_per_page=-1'); ?>
<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>

<?php $posts=query_posts($query_string . '&posts_per_page=-1'); ?>

<?php if (have_posts()) : ?>

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

Snippet Source/Credit: WPHacks