如何删除动作挂钩非静态方法和 class 无法实例化

Question

我正在使用 woocommerce 产品供应商插件，在单个产品页面中有 .我想将其替换为 ;

加起来像

class WC_Product_Vendors_Vendor_Frontend {
    public static function init() {
        $self = new self();

        add_action( 'woocommerce_single_product_summary', array( $self, 'add_sold_by_single' ), 39 );
   return true;
   }
   public function add_sold_by_cart( $values, $cart_item ) {
        $sold_by = get_option( 'wcpv_vendor_settings_display_show_by', 'yes' );

        if ( 'yes' === $sold_by ) {

            $sold_by = WC_Product_Vendors_Utils::get_sold_by_link( $cart_item['data']->id );

            $values[] = array(
                'name' => apply_filters( 'wcpv_sold_by_text', esc_html__( 'Sold By', 'woocommerce-product-vendors' ) ),
                'display' => '<em class="wcpv-sold-by-cart"><a href="' . esc_url( $sold_by['link'] ) . '" title="' . esc_attr( $sold_by['name'] ) . '">' . $sold_by['name'] . '</a></em>',
            );
        }

        return $values;
    }
}
WC_Product_Vendors_Vendor_Frontend::init();

我试着像

那样解开它

1)

add_action( 'wp_head', 'my_remove_actions', 39 );
function my_remove_actions(){
    remove_action( 'woocommerce_single_product_summary', array( 'WC_Product_Vendors_Vendor_Frontend', 'add_sold_by_single' ), 39 );
}

2)

 add_action( 'wp_head', 'my_remove_actions', 39 );
function my_remove_actions(){
    global $wc_product_vendors_vendor_frontend;
    $wc_product_vendors_vendor_frontend = new WC_Product_Vendors_Vendor_Frontend();

    remove_action( 'woocommerce_single_product_summary', array( $wc_product_vendors_vendor_frontend, 'add_sold_by_single' ), 39 );

}

3)

class XWC_Product_Vendors_Vendor_Frontend extends WC_Product_Vendors_Vendor_Frontend{
    public function __construct(){}
}

add_action( 'wp_head', 'my_remove_actions', 39 );
function my_remove_actions(){
    global $xwc_product_vendors_vendor_frontend;
    $xwc_product_vendors_vendor_frontend = new XWC_Product_Vendors_Vendor_Frontend();
    remove_action( 'woocommerce_single_product_summary', array( $xwc_product_vendors_vendor_frontend, 'add_sold_by_single' ), 39 );

}

4)

class XWC_Product_Vendors_Vendor_Frontend extends WC_Product_Vendors_Vendor_Frontend{
        public function __construct() {
    remove_action( 'woocommerce_single_product_summary', array( $this, 'add_sold_by_single' ), 39 );

    }
}
new XWC_Product_Vendors_Vendor_Frontend();

5)

class XWC_Product_Vendors_Vendor_Frontend extends WC_Product_Vendors_Vendor_Frontend{
            public static function init() {
            $self = new self();
        remove_action( 'woocommerce_single_product_summary', array( $self, 'add_sold_by_single' ), 39 );

        }
    }
XWC_Product_Vendors_Vendor_Frontend::init();

但是无法删除！请指导我这样做。

更新

我得到了

的输出

print_r($wp_filter['woocommerce_single_product_summary']);

Array
(
    [10] => Array
        (
            [woocommerce_template_single_price] => Array
                (
                    [function] => woocommerce_template_single_price
                    [accepted_args] => 1
                )
        )

    [20] => Array
        (
            [woocommerce_template_single_excerpt] => Array
                (
                    [function] => woocommerce_template_single_excerpt
                    [accepted_args] => 1
                )
        )

    [40] => Array
        (
            [woocommerce_template_single_meta] => Array
                (
                    [function] => woocommerce_template_single_meta
                    [accepted_args] => 1
                )
        )

    [50] => Array
        (
            [woocommerce_template_single_sharing] => Array
                (
                    [function] => woocommerce_template_single_sharing
                    [accepted_args] => 1
                )
        )

    [30] => Array
        (
            [woocommerce_template_single_add_to_cart] => Array
                (
                    [function] => woocommerce_template_single_add_to_cart
                    [accepted_args] => 1
                )
        )

    [39] => Array
        (
            [00000000262d19ef000000007f4708faadd_sold_by_single] => Array
                (
                    [function] => Array
                        (
                            [0] => WC_Product_Vendors_Vendor_Frontend Object
                                (
                                )

                            [1] => add_sold_by_single
                        )

                    [accepted_args] => 1
                )

            [le_child_add_sold_by_single] => Array
                (
                    [function] => le_child_add_sold_by_single
                    [accepted_args] => 1
                )
        )
)

Answer 1

试试这个：

add_action( 'woocommerce_before_single_product', 'my_remove_actions' );
function my_remove_actions(){
    remove_action( 'woocommerce_single_product_summary', array( 'WC_Product_Vendors_Vendor_Frontend', 'add_sold_by_single' ), 39 );
}

显示此过滤器的所有挂钩函数：

add_action( 'woocommerce_before_single_product', 'lets_have_a_look' );
function lets_have_a_look(){        
    global $wp_filter;
    print_r($wp_filter['woocommerce_single_product_summary']);
}

Answer 2

为什么这些解决方案对您不起作用？

为了注销回调，您必须获取对象的实例。这个插件的问题是：它没有通过为您提供获取实例的方法来正确使用 Singleton。因此，您无法获取实例。嘘

变通

我们需要解决方法。让我解释一下，以备日后使用。

WordPress Core 将所有已注册的回调与其事件注册表一起存储。当您执行 add_action 或 add_filter 时，回调将存储在此事件注册表中 table（这是一个大型多维数组）。为了取消注册（或删除）作为特定对象（而不是静态方法）中的方法的回调，您必须拥有该对象的实例。这意味着您需要代表您要定位的对象的变量。

在此示例中，您没有直接拥有它。但是 WordPress 使用它的对象哈希 ID 与方法名称连接来存储方法的密钥。我们可以使用该模式来获取事件注册表中的记录（元素）table。

/**
 * #EXPLANATION#
 * The plugin loads the file using `plugins_loaded` with a priority of 0.  Here
 * we are doing the same thing but after the file is loaded, meaning after the
 * events are registered.
 */

add_action( 'plugins_loaded', 'remove_woocommerce_add_sold_by_single_callback', 1 );
/**
 * Unregister the WooCommerce `WC_Product_Vendors_Vendor_Frontend::add_sold_by_single` from the
 * event `woocommerce_single_product_summary`.
 *
 * #EXPLANATION#
 * I'm adding comments in the code only to illustrate what is happening and why.  Please
 * remove the inline comments when using this code. Thank you.
 *
 * @since 1.0.0
 *
 * @return void
 */
function remove_woocommerce_add_sold_by_single_callback() {
    /**
     * #EXPLANATION#
     * WordPress keeps an event registry table for the callbacks that
     * are pre-registered to each event name.  The format of the table is:
     *
     * $wp_filter[ event name ][ priority number ][ callback name ]
     *
     * The registry table is a global variable called $wp_filter.  You need to include
     * that global into this function's scope.
     */
    global $wp_filter;

    /**
     * #EXPLANATION#
     * Let's make sure that the event name has a callback registered to the priority
     * number of 39. If no, then return early (bail out).
     */
    if ( ! isset( $wp_filter['woocommerce_single_product_summary']['39'] ) ) {
        return;
    }

    /**
     * #EXPLANATION#
     * We will loop through each of the registered callbacks for the priority of 39. Why?
     * You can't assume that only that one function is registered at 39.  There may be more.
     * Therefore, let's loop.
     *
     * We are grabbing the callback function that is registered.  This is a unique key. For
     * objects, WordPress uses the PHP construct spl_object_hash() to grab its hash ID. Then it
     * concatenates it together with the method's name.  You are not going to know what the unique
     * ID is. Why? The first 32 characters are the hash ID, which is a memory location and not
     * relative to the human readable name of `WC_Product_Vendors_Vendor_Frontend`.  Rather, it's
     * related to its object.
     */
    foreach( $wp_filter['woocommerce_single_product_summary']['39'] as $callback_function => $registration ) {
        /**
         * #EXPLANATION#
         * Give that we don't know what the first 32 characters of the object's hash ID is, we need
         * to check if the callback function includes the method we are looking for.  This line
         * of code says: "Hey, do you contain the method name `add_sold_by_single` starting at
         * the 32's character."  If yes, then this is the one we want.
         */
        if ( strpos( $callback_function, 'add_sold_by_single', 32) !== false) {

            /**
             * #EXPLANATION#
             * Now we have the actual callback function key that is registered in the
             * event registry.  We can use remove_action to unregister it.
             */
            remove_action( 'woocommerce_single_product_summary', $callback_function, 39 );

            break;
        }
    }
}

这段代码基本上是这样的：

检查是否已将任何内容注册到事件名称和优先级编号。如果否，则无事可做。让我们摆脱困境。
我们需要获取唯一 ID，或者 WordPress 称之为 $idx。这是回调的唯一键，由哈希 ID 组成。方法名称。
一旦我们有了唯一的 ID，您就可以使用 remove_action 注销回调。它也适用于 remove_filter。

可重用代码

上面的代码是为了说明如何做以及它是如何工作的。但是该代码不可重用，因为参数是硬编码的。相反，您需要使用 this code 然后像这样调用它（在插件中时）：

add_action( 'plugins_loaded', 'remove_woocommerce_add_sold_by_single_callback', 1 );
/**
 * Unregister the WooCommerce `WC_Product_Vendors_Vendor_Frontend::add_sold_by_single` from the
 * event `woocommerce_single_product_summary`.
 *
 * @since 1.0.0
 *
 * @return void
 */
function remove_woocommerce_add_sold_by_single_callback() {
    do_hard_unregister_object_callback( 'woocommerce_single_product_summary', 39, 'add_sold_by_single');
}

哪个事件？

如果您在插件中使用此代码（您应该这样做），请使用 plugins_loaded。

如果将它放入主题中，则不能使用 plugins_loaded，因为它在主题加载之前就已触发。对于主题，您需要使用 after_setup_theme 而不是 plugins_loaded。

测试

为了测试，让我们转储之前和之后的注册表，看看它是否确实删除了它。执行以下操作：

function remove_woocommerce_add_sold_by_single_callback() {
    global $wp_filter;

    var_dump( $wp_filter['woocommerce_single_product_summary'][39] );

    do_hard_unregister_object_callback( 'woocommerce_single_product_summary', 39, 'add_sold_by_single');

    if ( ! isset( $wp_filter['woocommerce_single_product_summary'][39] ) ) {
        var_dump( $wp_filter['woocommerce_single_product_summary'] );
    } else {
        var_dump( $wp_filter['woocommerce_single_product_summary'][39] );
    }
}

结果会让我们看看它是否从那里开始并在之后消失。

Answer 3

或者您可以通过 javascript 完成。

add_action( 'woocommerce_archive_description', "move_author_summary_to_image");
/**
 * Move the author summary right after the image so we can float them left and right.
 */
function move_author_summary_to_image() {
?>
    <script>
    $('document').ready (function () {
        var summary = $("#isle_body .wcpv-vendor-profile.entry-summary").html();
        $("#isle_body .wcpv-vendor-profile.entry-summary").hide();
        $(summary).addClass("author_summary").insertAfter($("#isle_body p.wcpv-vendor-logo")); 

    });
    </script>
<?php
}

如何删除动作挂钩非静态方法和 class 无法实例化

How to remove action hooking non static method and class can not be instantiated

wordpress

woocommerce

hook-woocommerce