These two files are for simple testing of KV-storages:

• Perl program tests GDBM, Berkeley and SDBM
• PHP program tests custom B-Tree implementation (https://github.com/jakubkulhan/btree)

They generate sequence of strings by applying md5 again and again (starting with some seed phrase).

By now there is some queer behavior of PHP version - result is different from perl when 5-letter key is used:

$ perl kvtest.pl 
1653 for 15f2e09c57461ca47604dfc8b8bcd678
$ php kvtest.php 
2935 for bf2926396fc07f370f454ee07dd5c1d2

while replacing btest with inmemory hash (array) makes result consistent (1653 steps also)