message: Fix to not use system PHP on macOS
  Refactor add_php in darwin.sh
diff: @@ -134,31 +134,43 @@ update_dependencies() {
  fi
  }
  +# Function to get PHP version if it is already installed using Homebrew.
  +get_brewed_php() {
  + php_cellar="$brew_prefix"/Cellar/php
  + if [ -d "$php_cellar" ] && ! [[ "$(find "$php_cellar" -maxdepth 1 -name "$version*" | wc -l 2>/dev/null)" -eq 0 ]]; then
  + php-config --version 2>/dev/null | cut -c 1-3
  + else
  + echo 'false';
  + fi
  +}
  +
  # Function to setup PHP 5.6 and newer using Homebrew.
  add_php() {
  action=$1
  + existing_version=$2
  + php_formula=shivammathur/php/php@"$version"
  add_brew_tap shivammathur/homebrew-php
  update_dependencies
  - if ! [[ "$(find "$(brew --cellar)"/php/ -maxdepth 1 -name "$version*" | wc -l 2>/dev/null)" -eq 0 ]] && [ "$action" != "upgrade" ]; then
  - brew unlink shivammathur/php/php@"$version"
  + if [ "$existing_version" != "false" ]; then
  + ([ "$action" = "upgrade" ] && brew upgrade -f "$php_formula") || brew unlink "$php_formula"
  else
  - brew upgrade -f "shivammathur/php/php@$version" 2>/dev/null || brew install -f "shivammathur/php/php@$version"
  + brew install -f "$php_formula"
  fi
  - brew link --force --overwrite shivammathur/php/php@"$version"
  + brew link --force --overwrite "$php_formula"
  }
  # Function to Setup PHP
  setup_php() {
  step_log "Setup PHP"
  - existing_version=$(php-config --version 2>/dev/null | cut -c 1-3)
  + existing_version=$(get_brewed_php)
  if [[ "$version" =~ ${old_versions:?} ]]; then
  run_script "php5-darwin" "${version/./}" >/dev/null 2>&1
  status="Installed"
  elif [ "$existing_version" != "$version" ]; then
  - add_php "install" >/dev/null 2>&1
  + add_php "install" "$existing_version" >/dev/null 2>&1
  status="Installed"
  elif [ "$existing_version" = "$version" ] && [ "${update:?}" = "true" ]; then
  - add_php "upgrade" >/dev/null 2>&1
  + add_php "upgrade" "$existing_version" >/dev/null 2>&1
  status="Updated to"
  else
  status="Found"
  