BREW

# userful commands

    brew search TEXT|/REGEX/
    brew info [FORMULA|CASK...]
    brew install FORMULA|CASK...
    brew update
    brew upgrade [FORMULA|CASK...]
    brew uninstall FORMULA|CASK...
    brew cleanup
    brew list --formula | grep php

# troubleshooting:

    brew config
    brew doctor
    brew install --verbose --debug FORMULA|CASK

# install XML::LibXML on a Mac. Once you have the libxml2 library installed, you can install the XML::LibXML Perl module using standard tools such as cpan or cpanm

    brew install libxml2
    cpan install XML::LibXML