It's probably worth mentioning that the regex-dna test time is kind of incorrect and provides an inaccurate view of what's happening.

Java-8 is using java.util.regex which is written in Java, PHP is passing the regex requests to it's own regex process which is actually a C package and performs a lot faster.

What we're actually comparing here is:

time(java.util.regex) > time(php compilation + c regex package)