已多次将此行为报告为错误:

This behavior has been reported as a bug a couple times:

• https://bugs.php.net/bug.php?id=42030
• https://bugs.php.net/bug.php?id=41641

• https://bugs.php.net/bug.php?id=42030
• https://bugs.php.net/bug.php?id=41641

我不清楚讨论的结果是什么，尽管这似乎与按值"和按引用"传递值有关.我在一些类似的代码中找到的解决方案做了一些事情像这样:

It is unclear to me what the result of the discussions was although it appears to have something to do with values being passed "by value" and "by reference". A solution that I found in some similar code did something like this:

function &__get( $index )
{
   if( array_key_exists( $index, self::$_array ) )
   {
      return self::$_array[ $index ];
   }
   return;
}

function &__set( $index, $value )
{
   if( !empty($index) )
   {
      if( is_object( $value ) || is_array( $value) )
      {
         self::$_array[ $index ] =& $value;
      }
      else
      {
         self::$_array[ $index ] =& $value;
      }
   }
}

请注意它们如何使用&__get和&__set，以及在分配值时使用& $value.我认为这是使这项工作有效的方法.

Notice how they use &__get and &__set and also when assigning the value use & $value. I think that is the way to make this work.