Ruby Binding and send concepts

Hi,
i am struggling to understand binding concepts, i am not able to find
good doc which can help me to understand or not able to find matching
doc with the code i am looking at .. please help me to understand it
with some examples ...

https://github.com/Katello/runcible/blob/master/lib/runcible/resources/consumer.rb

def self.create(id, optional={})
        required = required_params(binding.send(:local_variables),
binding)
        call(:post, path, :payload => { :required => required, :optional
=> optional })
      end

https://github.com/Katello/runcible/blob/master/lib/runcible/base.rb#L151

    def self.required_params(local_names, binding, keys_to_remove=[])
      local_names = local_names.reduce({}) do |acc, v|
        value = binding.eval(v.to_s) unless v == :_
        acc[v] = value unless value.nil?
        acc
      end

      #The double delete is to support 1.8.7 and 1.9.3
      local_names.delete(:payload)
      local_names.delete(:optional)
      local_names.delete("payload")
      local_names.delete("optional")
      keys_to_remove.each do |key|
        local_names.delete(key)
        local_names.delete(key.to_sym)
      end

      return local_names
    end


.. How binding works in above example ..  what i really want to
understand is below method .. or some example i can relate with ..

  def self.required_params(local_names, binding, keys_to_remove=[])
      local_names = local_names.reduce({}) do |acc, v|
        value = binding.eval(v.to_s) unless v == :_
        acc[v] = value unless value.nil?
        acc
      end


Regars,
DJ

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