Php 未捕获错误：在null |$selected_shipping_rates上调用成员函数get（）

我在我们的WP/WC网站上发现以下错误。这将根据发货方式从结帐中删除某些付款方式。这与最近的更新有关吗？我还看到这可能与对象缓存有关，但如果不重新编写函数，我就有点为难了

错误：

An error of type E_ERROR was caused in line 746 of the file /xxx/wp-content/themes/xxx/functions.php. Error message: Uncaught Error: Call to a member function get() on null in /xxx/wp-content/themes/xxx/functions.php:746

正在使用的代码：

function my_custom_available_payment_gateways( $gateways ) {
$chosen_shipping_rates = WC()->session->get( 'chosen_shipping_methods', array() );

if ( in_array( 'betrs_shipping:252-1', $chosen_shipping_rates ) ) :
    // Remove bank transfer payment gateway
    unset( $gateways['sagepayform'] );
elseif ( in_array( 'betrs_shipping:131-1', $chosen_shipping_rates ) ) :
    // Remove bank transfer payment gateway
    unset( $gateways['sagepayform'] );
elseif ( in_array( 'betrs_shipping:132-1', $chosen_shipping_rates ) ) :
    // Remove bank transfer payment gateway
    unset( $gateways['sagepayform'] );
elseif ( in_array( 'betrs_shipping:133-1', $chosen_shipping_rates ) ) :
    // Remove bank transfer payment gateway
    unset( $gateways['sagepayform'] );
elseif ( in_array( 'betrs_shipping:134-1', $chosen_shipping_rates ) ) :
    // Remove bank transfer payment gateway
    unset( $gateways['sagepayform'] );
elseif ( in_array( 'betrs_shipping:135-1', $chosen_shipping_rates ) ) :
    // Remove bank transfer payment gateway
    unset( $gateways['sagepayform'] );
elseif ( in_array( 'betrs_shipping:150-1', $chosen_shipping_rates ) ) :
    // Remove bank transfer payment gateway
    unset( $gateways['sagepayform'] );
elseif ( in_array( 'betrs_shipping:136-1', $chosen_shipping_rates ) ) :
    // Remove bank transfer payment gateway
    unset( $gateways['sagepayform'] );
elseif ( in_array( 'betrs_shipping:207-1', $chosen_shipping_rates ) ) :
    // Remove bank transfer payment gateway
    unset( $gateways['sagepayform'] );
elseif ( in_array( 'betrs_shipping:137-1', $chosen_shipping_rates ) ) :
    // Remove bank transfer payment gateway
    unset( $gateways['sagepayform'] );
elseif ( in_array( 'betrs_shipping:208-1', $chosen_shipping_rates ) ) :
    // Remove bank transfer payment gateway
    unset( $gateways['sagepayform'] );
elseif ( in_array( 'betrs_shipping:138-1', $chosen_shipping_rates ) ) :
    // Remove bank transfer payment gateway
    unset( $gateways['sagepayform'] );
elseif ( in_array( 'betrs_shipping:215-1', $chosen_shipping_rates ) ) :
    // Remove bank transfer payment gateway
    unset( $gateways['sagepayform'] );
elseif ( in_array( 'betrs_shipping:139-1', $chosen_shipping_rates ) ) :
    // Remove bank transfer payment gateway
    unset( $gateways['sagepayform'] );
elseif ( in_array( 'betrs_shipping:219-1', $chosen_shipping_rates ) ) :
    // Remove bank transfer payment gateway
    unset( $gateways['sagepayform'] );
endif;

return $gateways;
}
add_filter( 'woocommerce_available_payment_gateways', 'my_custom_available_payment_gateways' );

---

以及对代码进行空检查，以防止在会话为空时调用函数：

add_filter( 'woocommerce_available_payment_gateways', 'filter_woocommerce_available_payment_gateways' );
function filter_woocommerce_available_payment_gateways( $gateways ) {
    $session = WC()->session;

    if ( $session ) {
        $chosen_shipping_rates = $session->get( 'chosen_shipping_methods', [] );

        if ( in_array( 'betrs_shipping:252-1', $chosen_shipping_rates ) ) :
            // Remove bank transfer payment gateway
            unset( $gateways['sagepayform'] );
        elseif ( in_array( 'betrs_shipping:131-1', $chosen_shipping_rates ) ) :
            // Remove bank transfer payment gateway
            unset( $gateways['sagepayform'] );
        elseif ( in_array( 'betrs_shipping:132-1', $chosen_shipping_rates ) ) :
            // Remove bank transfer payment gateway
            unset( $gateways['sagepayform'] );
        elseif ( in_array( 'betrs_shipping:133-1', $chosen_shipping_rates ) ) :
            // Remove bank transfer payment gateway
            unset( $gateways['sagepayform'] );
        elseif ( in_array( 'betrs_shipping:134-1', $chosen_shipping_rates ) ) :
            // Remove bank transfer payment gateway
            unset( $gateways['sagepayform'] );
        elseif ( in_array( 'betrs_shipping:135-1', $chosen_shipping_rates ) ) :
            // Remove bank transfer payment gateway
            unset( $gateways['sagepayform'] );
        elseif ( in_array( 'betrs_shipping:150-1', $chosen_shipping_rates ) ) :
            // Remove bank transfer payment gateway
            unset( $gateways['sagepayform'] );
        elseif ( in_array( 'betrs_shipping:136-1', $chosen_shipping_rates ) ) :
            // Remove bank transfer payment gateway
            unset( $gateways['sagepayform'] );
        elseif ( in_array( 'betrs_shipping:207-1', $chosen_shipping_rates ) ) :
            // Remove bank transfer payment gateway
            unset( $gateways['sagepayform'] );
        elseif ( in_array( 'betrs_shipping:137-1', $chosen_shipping_rates ) ) :
            // Remove bank transfer payment gateway
            unset( $gateways['sagepayform'] );
        elseif ( in_array( 'betrs_shipping:208-1', $chosen_shipping_rates ) ) :
            // Remove bank transfer payment gateway
            unset( $gateways['sagepayform'] );
        elseif ( in_array( 'betrs_shipping:138-1', $chosen_shipping_rates ) ) :
            // Remove bank transfer payment gateway
            unset( $gateways['sagepayform'] );
        elseif ( in_array( 'betrs_shipping:215-1', $chosen_shipping_rates ) ) :
            // Remove bank transfer payment gateway
            unset( $gateways['sagepayform'] );
        elseif ( in_array( 'betrs_shipping:139-1', $chosen_shipping_rates ) ) :
            // Remove bank transfer payment gateway
            unset( $gateways['sagepayform'] );
        elseif ( in_array( 'betrs_shipping:219-1', $chosen_shipping_rates ) ) :
            // Remove bank transfer payment gateway
            unset( $gateways['sagepayform'] );
        endif;
    }

    return $gateways;
}

---

看起来

WC（）->session

为空。在这种情况下，没有获取方法。添加一个空检查，问题就应该消失了。@Mr.Jo您有时间给我指出正确的方向吗？我还注意到这个方法与我的方法类似，但看起来它检查用户是否是管理员，并且在签出过程中在不需要时停止调用函数：这只是一个简单的空检查lol。但是我可以帮你做。这就完成了。谢谢你，伙计！