With the growing popularity of Less, the Less compiler has been ported to other languages as well. These ports can be used to compile Less with native language calls. Please keep in mind that these ports will usually lag the official JavaScript implementation, so you may find they are missing recent Less features. You may also realize, as mentioned earlier in Chapter 3, Nested Rules, Operations, and Built-in Functions, that these compilers are not able to compile native JavaScript expressions within backticks.
This PHP port of the official Less processor can be download at http://lessphp.gpeasy.com/. You have seen an example of its usage already; the WP Less to CSS plugin has been built with it. Less.php also implements caching for faster compiling.
Although Less.php offers the possibility of creating CSS dynamically, you still should precompile your CSS for production in most cases. WordPress is also written in PHP, so...