Unified Sybase-DB style driver for PDO Formula was removed
Last version was

Revision: 11

php72-pdo-dblib requires the following formulae to be installed:
autoconf 2.69 Automatic configure script builder
freetds 1.00.91 Libraries to talk to Microsoft SQL Server and Sybase databases

Recent formula history

Jan Viljanen php72: migrate to homebrew/core (#4783)
Sean Molenaar php72 7.2.2
Sean Molenaar php72: 7.2.1
Andreas Braun php72 7.2.0
Andreas Braun php72 7.2.0-RC6

Formula code at GitHub