Как изменить версию PHP в Mac?

source ~/.profile
export PATH=/usr/local/php5-7.1.19-20180625-094435/bin:$PATH

##
# Your previous /Users/magentodev/.bash_profile file was backed up as /Users/magentodev/.bash_profile.macports-saved_2018-03-25_at_22:00:51
##

# MacPorts Installer addition on 2018-03-25_at_22:00:51: adding an appropriate PATH variable for use with MacPorts.
export PATH="/opt/local/bin:/opt/local/sbin:$PATH"
# Finished adapting your PATH environment variable for use with MacPorts.

MBP-Sergey:~ magentodev$ brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: "config" scripts exist outside your system or Homebrew directories.
`./configure` scripts often look for *-config scripts to determine if
software packages are installed, and what additional flags to use when
compiling and linking.

Having additional scripts in your path can confuse software installed via
Homebrew if the config script overrides a system or Homebrew provided
script of the same name. We found the following "config" scripts:
  /opt/local/bin/pkg-config
  /opt/local/bin/ncursesw6-config
  /opt/local/bin/pcre-config
  /opt/local/bin/ncurses6-config

Warning: You have MacPorts or Fink installed:
  /opt/local/bin/port

This can cause trouble. You don't have to uninstall them, but you may want to
temporarily move them out of the way, e.g.

  sudo mv /opt/local ~/macports

Warning: You have unlinked kegs in your Cellar
Leaving kegs unlinked can lead to build-trouble and cause brews that depend on
those kegs to fail to run properly once built. Run `brew link` on these:
  python@2

Warning: Broken symlinks were found. Remove them with `brew prune`:
  /usr/local/bin/docker
  /usr/local/bin/docker-compose
  /usr/local/bin/docker-compose.backup
  /usr/local/bin/docker-credential-osxkeychain
  /usr/local/bin/docker-credential-osxkeychain.backup
  /usr/local/bin/docker-machine
  /usr/local/bin/docker-machine.backup
  /usr/local/bin/docker.backup
  /usr/local/bin/hyperkit
  /usr/local/bin/hyperkit.backup
  /usr/local/bin/notary
  /usr/local/bin/notary.backup
  /usr/local/bin/vpnkit
  /usr/local/bin/vpnkit.backup
  /usr/local/opt/php56
  /usr/local/opt/php72

Warning: You have MacPorts or Fink installed:
/opt/local/bin/port

This can cause trouble. You don't have to uninstall them, but you may want to
temporarily move them out of the way, e.g.

Warning: You have unlinked kegs in your Cellar
Leaving kegs unlinked can lead to build-trouble and cause brews that depend on
those kegs to fail to run properly once built. Run `brew link` on these:
python@2

Warning: Broken symlinks were found. Remove them with `brew prune`:

MBP-Sergey:walabot magentodev$ brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: "config" scripts exist outside your system or Homebrew directories.
`./configure` scripts often look for *-config scripts to determine if
software packages are installed, and what additional flags to use when
compiling and linking.

Having additional scripts in your path can confuse software installed via
Homebrew if the config script overrides a system or Homebrew provided
script of the same name. We found the following "config" scripts:
  /opt/local/bin/pkg-config
  /opt/local/bin/ncursesw6-config
  /opt/local/bin/pcre-config
  /opt/local/bin/ncurses6-config

Warning: You have MacPorts or Fink installed:
  /opt/local/bin/port

This can cause trouble. You don't have to uninstall them, but you may want to
temporarily move them out of the way, e.g.

  sudo mv /opt/local ~/macports

У вас стоит так же MacPorts, рекомендуется выбрать что-то одно.

$ brew doctor
Your system is ready to brew.

Если не поможет - попробуйте переустановить
brew unlink php@7.0
brew install php@7.1

apachectl stop
sudo brew services start httpd