Use this to dynamically register a compiler function plugin. Pass
in the compiler function name, followed by the PHP function that
implements it.
动态注册一个编译函数插件,前两个参数是编译函数的名称、执行函数的名称。
The php-function callback
impl
can be either (a) a string containing the function name or (b) an array
of the form array(&$object, $method) with
&$object being a reference to an object
and $method being a string containing the
mehod-name or (c) an array of the form array(&$class,
$method) with $class being a classname
and $method being a class method of that
class.
执行函数的格式可以是一个包含函数名称的字符串;也可以是一个array(&$object, $method)数组形式,其中&$object是一个对象的引用,而$method是它的一个方法;还可以是一个array(&$ class, $method)数组形式,其中$class是一个类的名称,$method是类中的一个方法。
$cacheable
can be omitted in
most cases. See Controlling
Cacheability of Plugins' Output on how to it properly.
$cacheable 参数在大多数情况下可以省略。具体的使用方法可以查看控 制插件输出的缓存。