Description

Pass in the compiler function name, followed by the PHP function that implements it.

The php-function callback impl can be either:

1. a string containing the function name

2. an array of the form array(&$object, $method) with &$object being a reference to an object and $method being a string containing the method-name

3. an array of the form array(&$class, $method) with $class being a classname and $method being a class method of that class.

cacheable can be omitted in most cases. See Controlling Cacheability of Plugins' Output on how to use it properly.

See also unregister_compiler_function() and Plugin Compiler Functions.