A recent effort has been made to improve the performance of PHP by retrofitting a well-optimized Just-In-Time (JIT) compiler for a Java Virtual Machine to PHP. Tatsubori et al. evaluated this JIT compiler-based implementation of a PHP runtime and showed their JIT-based acceleration of PHP yields good performance improvements [23]. Whereas they show PHP benefits from modern JIT technology, we show the performance of PHP programs will likely also benefit from modern garbage collection technology.