How to create a custom search for custom post type?

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Here is what I’ve tried and got a solution with 3 steps. Let’s say your custom post type is “products“

1 . Add Function Code here you can specify the archive-search.php

function template_chooser($template)   
{    
  global $wp_query;   
  $post_type = get_query_var('post_type');   
  if( $wp_query->is_search && $post_type == 'products' )   
  {
    return locate_template('archive-search.php');  //  redirect to archive-search.php
  }   
  return $template;   
}
add_filter('template_include', 'template_chooser');

2 . Create search result template for custom post type ( archive-search.php )

        <?php
        /* Template Name: Custom Search */        
        get_header(); ?>             
        <div class="contentarea">
            <div id="content" class="content_right">  
                     <h3>Search Result for : <?php echo htmlentities($s, ENT_QUOTES, 'UTF-8'); ?> </h3>       
                     <?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>    
                <div id="post-<?php the_ID(); ?>" class="posts">        
                     <article>        
                    <h4><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></h4>        
                    <p><?php the_excerpt(); ?></p>        
                    <p align="right"><a href="<?php the_permalink(); ?>">Read     More</a></p>    
                    <span class="post-meta"> Post By <?php the_author(); ?>    
                     | Date : <?php echo date('j F Y'); ?></span>    

                    </article><!-- #post -->    
                </div>
        <?php endwhile; ?>
    <?php endif; ?>




           </div><!-- content -->    
        </div><!-- contentarea -->   
        <?php get_sidebar(); ?>
        <?php get_footer(); ?>

  1. Build Search Form
    In this Search Form, the value “products” is hidden and it will search only product posts.

     <div>   
    <h3>Search Products</h3>
    <form role="search" action="<?php echo site_url("https://wordpress.stackexchange.com/"); ?>" method="get" id="searchform">
    <input type="text" name="s" placeholder="Search Products"/>
    <input type="hidden" name="post_type" value="products" /> <!-- // hidden 'products' value -->
    <input type="submit" alt="Search" value="Search" />
  </form>
 </div>

for more, I would like to link you to here
http://www.wpbeginner.com/wp-tutorials/how-to-create-advanced-search-form-in-wordpress-for-custom-post-types/

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