WordPress - Show every result on search page

/* Display all results on search page */
function change_wp_search_size($query) {
    if ( $query->is_search ) // Make sure it is a search page
        $query->query_vars['posts_per_page'] = -1; // Change 10 to the number of posts you would like to show

    return $query; // Return our modified query variables
}
add_filter('pre_get_posts', 'change_wp_search_size');

gdeguglielmo

function working_remove_empty_p($content) {   
    $array = array (
        '<p>[' => '[', 
        ']</p>' => ']', 
        ']<br />' => ']',
        ']<br />' => ']'
    );
    $content = strtr($content, $array);
        return $content;
}