How to Create Advanced Search Form in WordPress for Custom P

// How to Create Advanced Search Form in WordPress for Custom Post Types

<form role="search" method="get" id="searchform" action="<?php echo home_url( '/' ); ?>">
<input type="text" name="s" id="s" <?php if(is_search()) { ?>value="<?php the_search_query(); ?>" <?php } else { ?>value="Enter keywords &hellip;" onfocus="if(this.value==this.defaultValue)this.value='';" onblur="if(this.value=='')this.value=this.defaultValue;"<?php } ?> /><br />

<?php $query_types = get_query_var('post_type'); ?>

<input type="checkbox" name="post_type[]" value="movies" <?php if (array('movies', $query_types)) { echo 'checked="checked"'; } ?> /><label>movies</label>
    <!-- here value="movies" and array(movies)  is my post type change your own-->

<input type="checkbox" name="post_type[]" value="movies" <?php if (array('movies', $query_types)) { echo 'checked="checked"'; } ?> /><label>movies</label>
    <!-- here value="movies" and array(movies)  is my post type change your own-->

<input type="submit" id="searchsubmit" value="Search" />
</form>