In order to use these functions, you must compile PHP with the --enable-overload option. Starting with PHP 4.3.0 this extension is enabled by default. You can disable overload support with --disable--overload .
PHP 的 Windows 版本已内建对此扩展的支持。不需要载入额外的扩展来使用这些函数。
Note: Builtin support for overload is available with PHP 4.3.0.