Modern and easy-to-use crypto library Formula was removed
Last versions were

Revision: 1

php72-libsodium requires the following formulae to be installed:
autoconf 2.69 Automatic configure script builder
libsodium 1.0.16 NaCl networking and cryptography library

Recent formula history

Jan Viljanen php72: libsodium is provided by core distro
Andreas Braun Bump revision for php72-libsodium
Romain Neutron php72-libsodium 1.0.6 (new formula)

Formula code at GitHub