PHP 调用时传递引用不可避免? [英] PHP Call-time pass-by-reference unavoidable?

问题描述

给定以下界面:

interface ISoapInterface {
  public static function registerSoapTypes( &$wsdl );
  public static function registerSoapOperations( &$server );
}

以及以下代码:

$soapProvider = array( "FilePool", "UserList" );
foreach( $soapProvider as $provider ) {
  call_user_func( array( $provider, "registerSoapTypes" ), &$server->wsdl );
  call_user_func( array( $provider, "registerSoapOperations" ), &$server );
}

FilePool 和 UserList 都实现了 ISoapInterface.

PHP 会抱怨 foreach 中的两个调用声明:

PHP will complain about the two calls inside the foreach stating:

调用时传递引用已被弃用

Call-time pass-by-reference has been deprecated

所以我查看了该消息，文档 似乎很清楚如何解决这个问题.从实际调用中删除与号.
所以我把我的代码改成这样:

So I looked that message up, and the documentation seems quite clear on how to resolve this. Removing the ampersand from the actual call.
So I changed my code to look like this:

$soapProvider = array( "FilePool", "UserList" );
foreach( $soapProvider as $provider ) {
  call_user_func( array( $provider, "registerSoapTypes" ), $server->wsdl );
  call_user_func( array( $provider, "registerSoapOperations" ), $server );
}

现在 PHP 抱怨

FilePool::registerSoapTypes 的参数 1 应为参考，给定值
FilePool::registerSoapOperations 的参数 1 应为参考，给定值

Parameter 1 to FilePool::registerSoapTypes expected to be reference, value given
Parameter 1 to FilePool::registerSoapOperations expected to be reference, value given

除此之外，该功能现已损坏.所以这显然不是解决方案.

In addition to that, the functionality is now broken. So this obviously can't be the solution.

推荐答案

来自 call_user_func:

注意 call_user_func() 的参数不是通过引用传递的.

Note that the parameters for call_user_func() are not passed by reference.

要调用静态方法，您可以使用 Class::method() 语法，为 Class 和/或 method 部分提供一个变量:

To invoke static methods you can use Class::method() syntax, supplying a variable for the Class and/or method parts:

$soapProvider = array( "FilePool", "UserList" );
foreach( $soapProvider as $provider ) {
  $provider::registerSoapTypes($server->wsdl);
  $provider::registerSoapOperations($server);
}

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