Php sprintf：在 %s 中组合 2 个变量值（字符串）

Question

使用 WooCommerce，我希望将 $gclid 变量的值组合到下面的 href="%s" 中。我通过将$gclid 放在$product->add_to_cart_url() 之后对其进行了编辑，但这不起作用。

global $product;
$gclid=$_GET['gclid']; //Read gclid and store it in $gclid

echo apply_filters(
    'woocommerce_loop_add_to_cart_link',
    sprintf(
         '<a rel="nofollow" href="%s" data-quantity="%s" data-product_id="%s" data-product_sku="%s" class="%s">%s</a>',
         esc_url( $product->add_to_cart_url().$gclid ),
         esc_attr( isset( $quantity ) ? $quantity : 1 ),
         esc_attr( $product->id ),
         esc_attr( $product->get_sku() ),
         esc_attr( isset( $class ) ? $class : 'button' ),
         esc_html( $product->add_to_cart_text() )
    ),
    $product
);

我做错了什么？

谢谢。

Answer 1

你的问题有点不清楚
您应该首先指定您要编辑 loop/add-to-cart.php WooCommerce 模板，该模板在商店和存档 WooCommerce 页面上显示 添加到购物车按钮。

因为它在 href <a> 标签中设置了一个 GET Url，例如：

http://www.myshop.com/shop/?add-to-cart=208 

要使其正常工作，您需要添加以下内容：

http://www.myshop.com/shop/?add-to-cart=208&gclid=601

这将添加 & + gclid= + gclid 的值（例如 @ 987654330@)…

所以下面的代码将完美运行（在 this test server 上查看它的实际效果）：

<?php
/**
 * Loop Add to Cart
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/loop/add-to-cart.php.
 *
 * HOWEVER, on occasion WooCommerce will need to update template files and you
 * (the theme developer) will need to copy the new files to your theme to
 * maintain compatibility. We try to do this as little as possible, but it does
 * happen. When this occurs the version of the template file will be bumped and
 * the readme will list any important changes.
 *
 * @see         https://docs.woocommerce.com/document/template-structure/
 * @author      WooThemes
 * @package     WooCommerce/Templates
 * @version     2.5.0
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

global $product;

// Just for testing (replace after with $gclid=$_GET['gclid'];)
$gclid = '&gclid=120';
// $gclid=$_GET['gclid'];

echo apply_filters( 'woocommerce_loop_add_to_cart_link',
    sprintf( '<a rel="nofollow" href="%s" data-quantity="%s" data-product_id="%s" data-product_sku="%s" class="%s">%s</a>',
        esc_url( $product->add_to_cart_url().$gclid ),
        esc_attr( isset( $quantity ) ? $quantity : 1 ),
        esc_attr( $product->id ),
        esc_attr( $product->get_sku() ),
        esc_attr( isset( $class ) ? $class : 'button' ),
        esc_html( $product->add_to_cart_text() )
    ),
$product );

// Checking that you get 'gclid' value (just for test)
// (will display normally the 'gclid' value after the button add-to-cart)
echo '<p>gclid value: '. $_GET['gclid'] .</p>;

问题肯定来自您的$gclid=$_GET['gclid'];。
你必须确保你得到了'gclid'的价值。

一旦你确定你得到了 'gclid' 值，你应该稍微改变一下，这样：

 $gclid= '&gclid=' . $_GET['gclid'];

这应该可行……