jterrace/js.js - GitHub
https://github.com/jterrace/js.js
Instead of trying to create an interpreter from scratch, SpiderMonkey is compiled into LLVM and then emscripten translates the output into JavaScript.
JSLint Commandline Shenanigans
http://whereisandy.com/code/jslint
"y running JSLint on all of our javascript files as part of our development process, we can find these nasty bugs before they start!Turns out, Spidermonkey isn't just faster than Rhino, it's a lot faster (at least to start up)."
Using JavaScript in PHP with PECL and SpiderMonkey
http://devzone.zend.com/article/4704-Using-JavaScript-in-PHP-with-PECL-and-SpiderMonkey
"SpiderMonkey support in PHP comes through PECL's ext/spidermonkey extension, which is maintained by Christophe Robin, and provides an object-oriented API for accessing the SpiderMonkey library. Although this extension is currently in beta, it still allows you to do some fairly interesting things, including registering and using variables, functions and classes from PHP in JavaScript."