Beginning with PHP 4.3.0 these functions are enabled by default. For older versions you have to configure and compile PHP with --enable-tokenizer . You can disable tokenizer support with --disable-tokenizer .
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: Built-in support for tokenizer is available as of PHP 4.3.0.