chdb
PHP Manual

Einf├╝hrung

CHDB (constant hash database) is a fast key-value database for constant data, realized by using a memory-mapped file and thus providing the following functionalities:

A typical use of CHDB is as a faster alternative to defining many PHP constants.

CHDB is internally implemented as a hash-table using a » perfect hashing function, thus guaranteeing worst case O(1) lookup time.


chdb
PHP Manual