phps.sh

#!/bin/sh

if [ -z $1 ]
then
  echo 'Please enter which version you want to switch to (e.g. `phps 55`, or `phps 53`)'
  exit
fi

etc="/Users/deetergp/etc"
version=$1

###
 # Decides whether or not to switch the php version.
 ##
function php_switch() {
  case ${version} in
    53|55)
      set_new_php_version;
      break;;
    *)
      echo "Not a supported version";
      break;;
  esac
}

###
 # Returns a shorthand of the current PHP version.
 ##
function get_current_version() {
  local current_version=$(php --version)
  case ${current_version} in
    'PHP 5.3'*)
      local result=53;
      break;;
    'PHP 5.5'*)
      local result=55;
      break;;
    *)
      exit;;
  esac
  echo ${result}
}

###
 # Returns true if the requested version is the same as the current version.
 ##
function get_version_difference() {
  local current_version=$(get_current_version)
  if [ ${version} == ${current_version} ]
  then
    echo 0
  else
    echo 1
  fi
}

###
 # Does the actual switching of the PHP version.
 ##
function set_new_php_version() {
  local version_difference=$(get_version_difference)
  local current_version=$(get_current_version)
  if [ ${version_difference} == 0 ]
  then
    echo "You are currently on php${version}."
    exit
  fi

  echo "Switching to php${version}"

  # I keep a version of my .zshrc & httpd.conf files where the path for each
  # version of the homebrew/josegonzalez PHP package.
  sudo cp ${etc}/httpd.conf.php${version} /etc/apache2/httpd.conf
  sudo cp ${etc}/zshrc.php${version} /Users/deetergp/.zshrc

  # Changes the links for which version of PHP Homebrew should use.
  brew unlink php${current_version}
  brew link php${version}

  # Restarts the OS X Apache server and refreshes the .zhsrc file.
  sudo apachectl restart
  exec zsh
}

php_switch