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Clearly it's because PHP programmers are superior. Otherwise Groovy would beat it hands down.

Have the poster read the benchmarks? groovy is faster but has worst use of memory. This post is stupid. The linked site has no fault in this only the poster.

Hehehe , hard comments !. however i like Groovy a lot more than php and i was just wondering
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Apples vs oranges.

The top contenders in the pidigits benchmark are only testing quickly they can make calls to libgmp. PHP uses libgmp whereas the groovy version uses java.util.BigInteger. The java6 -server version of the same benchmark that also uses the slow j.u.BigInteger is just as fast as the groovy version (62.95 vs. 63.07 seconds, respectively). A groovy version that used libgmp would beat the PHP version, just like the Java versions do.

I haven't grokked the reverse complement benchmark yet, but the PHP version, besides from apparently being faster, also looks much more readable.