Custom Search Functionality — a practical guide to WordPress custom search theme with clear examples you can reuse in real projects.
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Short description
Override `searchform.php` and use `pre_get_posts` carefully to include CPTs when needed.
searchform.php sketch
<form role="search" method="get" action="<?php echo esc_url(home_url('/')); ?>">
<label><span class="screen-reader-text">Search</span>
<input type="search" name="s" value="<?php echo esc_attr(get_search_query()); ?>"></label>
<button type="submit">Search</button>
</form>