Search form for special post type.

search-form-for-special-post-type.php

<!-- search for special one post type -->
<div class="search-form">
	<form role="search" method="get" class="search-form mc-form bottom" action="<?php echo esc_url( home_url( '/' ) ); ?>">
		<input type="search" class="search-field" placeholder="<?php esc_html_e( 'Enter your keyword', 'text-domain' ) ?>" value="<?php echo esc_attr( get_search_query() ); ?>" name="s" />
		<input type="hidden" name="post_type" value="product">
		<button type="submit" class="search-submit"><span class="ti ti-search"></span></button>
	</form>
</div>

<!-- search for special two or more post type -->
<div class="search-form">
	<form role="search" method="get" class="search-form mc-form bottom" action="<?php echo esc_url( home_url( '/' ) ); ?>">
		<input type="search" class="search-field" placeholder="<?php esc_html_e( 'Enter your keyword', 'text-domain' ) ?>" value="<?php echo esc_attr( get_search_query() ); ?>" name="s" />
		<input type="hidden" name="post_type" value="book">
		<input type="hidden" name="post_type" value="movie">
		<button type="submit" class="search-submit"><span class="ti ti-search"></span></button>
	</form>
</div>