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<?php 

///Renewal subscription
add_filter( 'views_edit-shop_order', 'yith_add_renewal_subscription' );
function yith_add_renewal_subscription( $views ) {

    $post_status = wc_get_order_statuses();

    $args = array(
        'post_type'   => 'shop_order',
        'post_status' => array_keys( $post_status ),
        'meta_key'    => 'is_a_renew',
        'meta_value'  => 'yes',
        'posts_per_page' => -1
    );

    $posts                         = get_posts( $args );
    $count                         = $posts ? count( $posts ) : 0;
    $link                          = sprintf( '<a href="edit.php?is_a_renew=yes&post_type=shop_order">%s<span class="count"> (%d)</span></a>', __( 'Renewal subscription', 'yit' ), $count );
    $views['renewal_subscription'] = $link;

    return $views;
}

add_filter( 'request', 'yith_renewal_subscription_request_query' );
function yith_renewal_subscription_request_query( $vars ) {

    if ( isset( $vars['post_type'] ) && $vars['post_type'] == 'shop_order' ) {
        if ( ! empty( $_GET['is_a_renew'] ) ) {
            $vars['meta_key']   = 'is_a_renew';
            $vars['meta_value'] = wc_clean( $_GET['is_a_renew'] );
        }
    }

    return $vars;
}