Switch PHP versions script

sphp.sh

#!/usr/bin/env bash

BREW_PREFIX=$(brew --prefix | sed 's#/#\\\/#g')
BREW_ARRAY=("5.6","7.0","7.1","7.2")
PHP_ARRAY=("php@5.6" "php@7.0" "php@7.1" "php@7.2")
PHP_INSTALLED_ARRAY=()
PHP_VERSION="php@$1"
PROFILE="/Users/prm/.zshrc"

# Has the user submitted a version required
if [[ -z "$1" ]]
then
	echo "usage: sphp version"; echo;
	echo "    version    one of:" ${BREW_ARRAY[@]};
	exit
fi

# What versions of php are installed via brew
for i in ${PHP_ARRAY[*]}
	do
		if [[ -n "$(brew ls --versions "$i")" ]]
		then
			PHP_INSTALLED_ARRAY+=("$i")
		fi
done

# Check that the requested version is supported
if [[ " ${PHP_ARRAY[*]} " == *"${PHP_VERSION}"* ]]
then
	# Check that the requested version is installed
	if [[ " ${PHP_INSTALLED_ARRAY[*]} " == *"${PHP_VERSION}"* ]]
	then

		# Switch Shell
		echo "Switching to ${PHP_VERSION}"
		echo "Stoping services and switching your shell"
		for i in ${PHP_INSTALLED_ARRAY[@]}
		do
			brew unlink "${i}" >/dev/null 2>&1
			brew services stop "${i}" >/dev/null 2>&1
		done

		brew link --force "${PHP_VERSION}" >/dev/null 2>&1

		sed -i "/^path=(\/usr\/local\/opt\/php.*/s/^/#/" "${PROFILE}"
		sed -i "/path=(\/usr\/local\/opt\/${PHP_VERSION}/s/^#//" "${PROFILE}"

		echo "Starting services"
		brew services start "${PHP_VERSION}" >/dev/null 2>&1

		exec /bin/zsh
		source $PROFILE

		echo "You're good!"
	else
		echo "Sorry, but ${PHP_VERSION} is not installed via brew. Install it by running: brew install ${PHP_VERSION}"
	fi
else
	echo "You specified an unknown version. PHP Switcher only knows of:" ${BREW_ARRAY[@]}
fi