You can see the new tests here: https://github.com/php/php-src/blob/master/ext/hash/tests/gost.phpt?source=c
echo hash('gost-crypto', 'The quick brown fox jumps over the lazy dog'), "\n";
The relevant ticket with more explanations is here: https://github.com/php/php-src/pull/430
This adds a new hash identifier "gost-crypto" which uses the CryptoPro S-box tables as specified by RFC 4357, section 11.2.
GOST algorithm with CryptoPro S-Box generates different set of hash values. CryptoPro S-box is required among other for DNSSEC GOST signatures (RFC 5933).