Separating Search Results By Post Type

Original question: Seperating Custom Post Search Results

I’ve tried to implement this code to my website, but i have some problem with it.
What i’ve changed is i’ve added another switch for third post type, as follows:

<?php if (have_posts()) : ?>
    <?php
    $last_type = "";
    $typecount = 0;
    while (have_posts()) :
        the_post();
        if ($last_type != $post->post_type) {
            $typecount = $typecount + 1;
            if ($typecount > 1) {
                echo '</div><!-- close container -->'; //close type container
            }
            // save the post type.
            $last_type = $post->post_type;
            //open type container
            switch ($post->post_type) {
                case 'post':
                    echo "<div class=\"postsearch container\"><h2>Blog Results</h2>";
                    break;
                case 'partner':
                    echo "<div class=\"partnersearch container\"><h2>Partner Search Results</h2>";
                    break;
                case 'fiches_pratiques':
                    echo "<div class=\"lessonsearch container\"><h2>lesson Search Results</h2>";
                    break;
            }
        }
        ?>

        <?php if ('post' == get_post_type()) : ?>
            <li class="post"><?php the_title(); ?></li>
        <?php endif; ?>

        <?php if ('partner' == get_post_type()) : ?>
            <li class="partner"><?php the_title(); ?></li>
        <?php endif; ?>

        <?php if ('lesson' == get_post_type()) : ?>
            <li class="lesson"><?php the_title(); ?></li>
        <?php endif; ?>


    <?php endwhile; ?>

<?php else : ?>
    <div class="open-a-div">
        <p>No results found.</p>    

    <?php endif; ?>       

This code results in following:

Lessons Search Results

Lesson 1 Lesson 4 Lesson 3

Blog Results

Test sub

Partner Search Results

Fourth partner

Blog Results

Lorem ipsum Wave 2.0 Web & Tech Cloud Open Container Project

As you can notice, the blog results section is doubled.
Any suggestions on what might be the problem?

Installed search plugins:
Relevanssi

NOTE: without Relevanssi (but with Search Everything plugin) it shows it in a proper way, but Search Everything plugin doesn’t allow multiple terms search, which is a must have in my case.

Latest WordPress version.

Thank you in advance.

Here is an idea, sort your your loop before it executes. Your current issue is just this. You will see that the type of sorting (if I’m correct where I believe your order is not alphabetical according to post type) is not possible natively, so we need a work-around (even if you just need post types sorted alphabetically, the native way still lack proper functionality). This is where usort() comes in, we can sort the post type post in any order we want. This will be done inside the the_posts filter

I can show you both examples. NOTE: The code sample requires at least PHP 5.4+, which should be your minimum version now. All versions before 5.4 is EOL’ed, not supported and therefor a huge security risk if you are still using those versions.

SORT BY CUSTOM POST TYPE ORDER

add_filter( 'the_posts', function( $posts, $q ) 
{
    if( $q->is_main_query() && $q->is_search() ) 
    {
        usort( $posts, function( $a, $b ){
            /**
             * Sort by post type. If the post type between two posts are the same
             * sort by post date. Make sure you change your post types according to 
             * your specific post types. This is my post types on my test site
             */
            $post_types = [
                'event_type' => 1,
                'post'       => 2,
                'cameras'    => 3
            ];              
            if ( $post_types[$a->post_type] != $post_types[$b->post_type] ) {
                return $post_types[$a->post_type] - $post_types[$b->post_type];
            } else {
                return $a->post_date < $b->post_date; // Change to > if you need oldest posts first
            }
        });
    }
    return $posts;
}, 10, 2 );

SORT BY POST TYPE ALPHABETICAL ORDER

add_filter( 'the_posts', function( $posts, $q ) 
{
    if( $q->is_main_query() && $q->is_search() ) 
    {
        usort( $posts, function( $a, $b ){
            /**
             * Sort by post type. If the post type between two posts are the same
             * sort by post date. Be sure to change this accordingly
             */

            if ( $a->post_type != $b->post_type ) {
                return strcasecmp( 
                    $a->post_type, // Change these two values around to sort descending
                    $b->post_type 
                );
            } else {
                return $a->post_date < $b->post_date; // Change to > if you need oldest posts first
            }
        });
    }
    return $posts;
}, 10, 2 );

Your posts should now be sorted by post type on your search page, that is, if you are not using a custom query in place of your main query. As for your code above, keep it as is, not necessary to make any adjustments to it