Question

我的功能如下：

function custom_field( $something ) {
   // code goes here
}

在特殊情况下，我想以某种方式取消它。我有类似的东西：

if (function_exists("custom_field")) {
    unset(custom_field());
}

unset的使用在我得到的情况下不会起作用＆＃34;致命错误：在写上下文中不能使用函数返回值＆＃34;。

如何取消设定功能？我已经检查了runkit_function_remove（不确定这是否可以解决我的问题）但是需要安装PECL，我的主机不会为我安装。

有什么建议吗？

编辑：

我将使用更多代码进行更新（使用wordpress和woocommerce）：

我显示如下的复选框：

add_action('woocommerce_after_order_notes', 'my_custom_checkout_field1');

function my_custom_checkout_field1( $checkout22 ) {


    echo '<div id="my-new-field"><h3>'.__('Homedelivery:').'</h3>';

    woocommerce_form_field( 'Homedelivery', array(
        'type'          => 'checkbox',
        'class'         => array('input-checkbox'),
        'label'         => __('Message here.'),
        'required'  => false,
        ), $checkout22->get_value( 'my_checkbox' ));

    echo '</div>';
}


add_action('woocommerce_checkout_process', 'my_custom_checkout_field_process1');

function my_custom_checkout_field_process1() {
    global $woocommerce;

    // Check if set, if its not set add an error.
    if (!$_POST['my_checkbox']) {
         //$woocommerce->add_error( __('Please agree to my checkbox.') );
         $_POST['my_checkbox'] = "Customer wants to be home when package is delivered.";
         } else {
             $_POST['my_checkbox'] = "Customers sais its ok the leave the package outside the door.";
         }

}


add_action('woocommerce_checkout_update_order_meta1', 'my_custom_checkout_field_update_order_meta');

function my_custom_checkout_field_update_order_meta1( $order_id ) {
    if ($_POST['my_checkbox']) update_post_meta( $order_id, 'My Checkbox', esc_attr($_POST['my_checkbox']));
}

我希望此复选框只有在＆＃39; local_deliver＆＃39;被选中：

function payment_gateway_disable_country($available_gateways) {

    global $woocommerce;

    $packages = $woocommerce->shipping->get_packages();

    foreach ( $packages as $i => $package ) {
        $chosen_method = isset( $woocommerce->session->chosen_shipping_methods[ $i ] ) ?
        $woocommerce->session->chosen_shipping_methods[ $i ] :  '';

        // hämta i kyrkhult
        if ('local_pickup' == $chosen_method) {  
            global $woocommerce;
            foreach ($woocommerce->cart->cart_contents as $key => $values ) {

        if($values['product_id'] && get_field('farskvara',$values['product_id'])){

        unset($available_gateways['cod']);

        break;
        } else {

            unset($available_gateways['cod']);
        }
        }

        } elseif ('flat_rate' == $chosen_method) {  

    global $woocommerce;
    foreach ($woocommerce->cart->cart_contents as $key => $values ) {

        if($values['product_id'] && get_field('farskvara',$values['product_id'])){

        unset($available_gateways['cheque']);


        break;
        } else {
            unset($available_gateways['cheque']);

        }
        }

    } elseif ('local_delivery' == $chosen_method) {

    global $woocommerce;
    foreach ($woocommerce->cart->cart_contents as $key => $values ) {

        if($values['product_id'] && get_field('farskvara',$values['product_id'])){

        unset($available_gateways['cheque']);
        break;
        } else {
            unset($available_gateways['cheque']);
        }
        }


    }

    }

return $available_gateways;

}

add_filter(
    'woocommerce_available_payment_gateways',
    'payment_gateway_disable_country'
);

如何解决这个问题？

Answer 1

尝试取消设置函数是非常奇怪的，PHP不会让你这样做。

如果function_exists取消设置呢？

1 个答案: