The PHP's version of JOAAT encryption algorithm. The Jenkins hash functions are a collection of (non-cryptographic) hash functions for multi-byte keys.

They can be used also as checksums to detect accidental data corruption or detect identical records in a database.

Each of the 24 rows corresponds to a single bit in the 3-byte input key, and each of the 32 columns corresponds to a bit in the output hash. Colors are chosen by how well the input key bit affects the given output hash bit: a green square indicates good mixing behavior, a yellow square weak mixing behavior, and red would indicate no mixing. Only a few bits in the last byte of the input key are weakly mixed to a minority of bits in the output hash.