应该是PHP版本有问题，homebrew-php的源码,你尝试安装一下5.3+的版本。

def php_branch
    class_name = self.class.name.split("::").last
    matches = /^Php5([3-9]+)/.match(class_name)
    if matches
      "5." + matches[1]
    else
      raise "Unable to guess PHP branch for #{class_name}"
    end
  end