Php env bench

Benchmarking env loaders/parsers for PHP.

Candidates: adhocore/env, vlucas/dotenv, symfony/dotenv.

git clone git@github.com/adhocore/env-bench.git

cd env-bench

composer install -o

vendor/bin/phpbench run src --report aggregate

Retrieving has not been benchmarked because none of the other except adhocore/env provide a factory way of retrieval. And this definitely is not benchmark for native getenv()!