title: Rails: How to get all parameters from url?
body: <p>Usually, we use like:  </p>
  
  <pre><code> params[:a] #to get a specific parameter's value
  </code></pre>
  
  <p>But how to get all the parameters the way we do in PHP? </p>
  
  <pre><code>  $_GET or $_POST
  </code></pre>