PHP extension for Molten Formula was removed
Last versions were

Revision: 2

php56-molten requires the following formulae to be installed:
autoconf 2.69 Automatic configure script builder

Recent formula history

ilovezfs php56: migrate to homebrew/core (#4835)
Mike McQuaid php56-molten: use <<~EOS.
BePsvPT igbinary 2.0.5 for php5x dependencies
Jan Viljanen php-molten: revision bump
zouyi6 php-molten: 0.1.1 (new formula)

Formula code at GitHub