Php woocommerce_available_ payment_gateways 过滤器挂钩多次触发

当加载 checkout 时以及在AJAX事件(其中$_GET被绕过)时，过滤器挂钩woocommerce_available_payment_gateways被多次触发.因此，您需要尽早将URL变量保存在WC会话变量中.

try 以下操作:

// Save the url variable in a WC Session variable
add_action( 'template_redirect', 'save_checkoutid_as_wc_session_variable' );
function save_checkoutid_as_wc_session_variable() {
    if( is_checkout() && isset($_GET[ 'checkoutid']) && $_GET['checkoutid' ] == '50' ){
        WC()->session->set('checkout_id', esc_attr($_GET['checkoutid']));
    }
}

add_filter( 'woocommerce_available_payment_gateways', 'selected_custom_checkout_gateways' );
function selected_custom_checkout_gateways( $available_gateways ) {
    // Not in backend (admin)
    if( ! is_admin() && isset(WC()->session) ) {
        $checkout_id = WC()->session->get('checkout_id');

        if( $checkout_id  == '50' ){
            $code = 123123; // For testing
            unset( $available_gateways[ 'cod' ], $available_gateways[ 'cheque' ] ) ;
        }
        else{
            $code = 5555; // for testing
        }
        
        $debug = "code: {$code} | checkout_id: {$checkout_id}"; // for testing
        error_log($debug); // for testing
    }
    return $available_gateways;
}

// Remove the WC Session variable once the order is created
add_action( 'woocommerce_checkout_order_created', 'remove_checkout_id_wc_session_variable' );
function remove_checkout_id_wc_session_variable() {
    if ( WC()->session->__isset('checkout_id') ){ 
        WC()->session->__unset('checkout_id');
    }
}

代码位于您的子主题的unctions.php文件中(或在插件中).现在应该行得通了.