Problem Statement

SHA-256 is the recommended stronger alternative to SHA-1. See FIPS PUB 180-4 for implementation details. Either by using a dedicated library or implementing the algorithm in your language, show that the SHA-256 digest of the string "Rosetta code" is: 764faf5c61ac315f1497f9dfa542713965b785e5cc2f707d6468d7d1124cdfcf

Let's start with the solution:

$var = "Rosetta code";
echo sha2($var, 256);