正在尝试在函数中使用此代码。php，但不工作。。知道怎么了吗？

// To change the amount of days just change \'-7 days\' to your liking
function get_unpaid_submitted() {        
            global $wpdb;

            $unpaid_submitted = $wpdb->get_col( $wpdb->prepare( "
                    SELECT posts.ID
                    FROM {$wpdb->posts} AS posts
                    WHERE posts.post_status = \'wc-processing\'
                    AND posts.post_date < %s
            ", date( \'Y-m-d H:i:s\', strtotime(\'-14 days\') ) ) );

            return $unpaid_submitted;
    }

    // This excludes check payment type.
    function wc_cancel_unpaid_submitted() {        
            $unpaid_submit = get_unpaid_submitted();

            if ( $unpaid_submit ) {                
                    foreach ( $unpaid_submit as $unpaid_order ) {                        
                            $order = wc_get_order( $unpaid_order );
                            $cancel_order = True;

                            foreach  ( $order->get_items() as $item_key => $item_values) {                                
                                    $manage_stock = get_post_meta( $item_values[\'variation_id\'], \'_manage_stock\', true );
                                    if ( $manage_stock == "no" ) {                                        
                                            $payment_method = $order->get_payment_method();                                        
                                            if ( $payment_method == "cheque" ) {
                                                    $cancel_order = False;
                                            }
                                    }                                
                            }
                            if ( $cancel_order == True ) {
                                    $order -> update_status( \'cancelled\', __( \'Pagamento não identificado e cancelado.\', \'woocommerce\') );
                            }
                    }
            }        
    }
    add_action( \'woocommerce_cancel_unpaid_submitted\', \'wc_cancel_unpaid_submitted\' );
    /* End of code. */