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I need your expertise about multiple checkbox, Right now even you choose multiple category on the checkbox, it only shows one category, Please check the code below and im using the wordpress system on this project and custom post type, it works but it only shows one category you can check the code below

index start with if terms categories print for the checkbox

<form action="<?php echo site_url() ?>/wp-admin/admin-ajax.php" method="POST" id="filter">
 <?php
 if( $terms = get_terms( 'categories_printi', 'orderby=name' ) ) : // to make it simple I use default categories
 echo '<div id="chkveg" name="categories_printi"';
 foreach ( $terms as $term ) :
 echo '<label><input type="checkbox" name="categories_printi" value="' . $term->term_id . '">' . $term->name . '</label>'; // ID of the category as the value of an option
 endforeach;
 echo '</div>';
 endif;
 ?>

 <select name="date" id="misha_order_by">
 <option name="date" value="DESC">Date &darr;</option><!-- I will explode these values by "-" symbol later -->
 <option name="date" value="ASC">Date &uarr;</option>
 </select>


 <button>Apply filter</button>
 <input type="hidden" name="action" value="myfilter">
 </form>
 <div id="response"></div>

Function.php, Please include content.php so it will show the post item

wp_localize_script( 'misha_scripts', 'misha_loadmore_params', array(
 'ajaxurl' => site_url() . '/wp-admin/admin-ajax.php', // WordPress AJAX
 'posts' => json_encode( $wp_query->query_vars ), // everything about your loop is here
 'current_page' => $wp_query->query_vars['paged'] ? $wp_query->query_vars['paged'] : 1,
 'max_page' => $wp_query->max_num_pages
) );
add_action( 'wp_before_admin_bar_render', 'mytheme_admin_bar_render' );
function misha_filter_function()


add_action('wp_ajax_myfilter', 'misha_filter_function');
add_action('wp_ajax_nopriv_myfilter', 'misha_filter_function');

Links: For pastie

Function https://www.pastiebin.com/5bebabfbe13bb
index https://www.pastiebin.com/5bebac4218629
Content https://www.pastiebin.com/5bebac5cb163e