Installing PHPenv

Go here: https://github.com/phpenv/phpenv

Install by using git clone, or just downloading the zip to this location:

git clone git@github.com:phpenv/phpenv.git ~/.phpenv

Add it to the path:

echo 'export PATH="$HOME/.phpenv/bin:$PATH"' >> ~/.bash_profile
# or
echo 'export PATH="$HOME/.phpenv/bin:$PATH"' >> ~/.zprofile

Add autocompletion:

echo 'eval "$(phpenv init -)"' >> ~/.bash_profile
# or
echo 'eval "$(phpenv init -)"' >> ~/.zprofile

Restart shell:

exec $SHELL -l

Then, go here: https://github.com/php-build/php-build

Install php-build as a plugin, either using the script (which only works if you used git clone at the beginning) or manually putting it into the .phpenv/plugins directory (which probably won't exist, so create it)

Run this to see what versions are available:

phpenv install -l

Then, install a version, e.g.:

phpenv install 5.6.40

(If on Mac, first make sure autoconf is installed:)

brew install autoconf automake libtool