С вебкитом скорее всего не найдете, но зато есть неплохой вариант.
j-php.net- JIT (~2.5 faster PHP 5.6, ~1.1 faster PHP 7), Optimizer - Performance benchmarks
- Using java libraries and classes in PHP code.
- Unicode for strings (UTF-16, like in Java)
- Threading, Sockets, Environment architecture (like sandbox objects in the runkit zend extension).
- GUI (based on Swing, improved - more flexible layouts)
- Embedded cache system for classes and functions
- Optional Hot Reloading for classes and functions
- Ability to use on Android OS