title: http_build_query() dot is converted to underscore
body: <p>Please check the below array:</p>
  
  <pre><code>Array([bunrey] =&gt; Array ([0] =&gt; 20130730181908615391000000)
        [mt.shasta] =&gt; Array ( 
          [0] =&gt; 20130708203742347410000000
          [1] =&gt; 20130213201456984069000000
          [2] =&gt; 20130712144459481348000000
        )
        [shingletwon] =&gt; Array
        (
          [0] =&gt; 20130801233842122771000000
        )
  )
  </code></pre>
  
  <p>I want to send this array as query string using <code>http_build_query()</code>,
  I got the below string after using <code>http_build_query()</code>:</p>
  
  <pre><code>bunrey%5B0%5D=20130730181908615391000000&amp;mt.shasta%5B0%5D=20130708203742347410000000&amp;mt.shasta%5B1%5D=20130213201456984069000000&amp;mt.shasta%5B2%5D=20130712144459481348000000&amp;shingletwon%5B0%5D=20130801233842122771000000
  </code></pre>
  
  <p>As you can see after sending this query string to some other file, there I am trying to retrieve. I had echoed the <code>$_REQUEST</code> object:</p>
  
  <pre><code>Array (
  [bunrey] =&gt; Array
      (
          [0] =&gt; 20130730181908615391000000
      )
  
  [mt_shasta] =&gt; Array
      (
          [0] =&gt; 20130708203742347410000000
          [1] =&gt; 20130213201456984069000000
          [2] =&gt; 20130712144459481348000000
      )
  [shingletwon] =&gt; Array
      (
          [0] =&gt; 20130801233842122771000000
      )
  )
  </code></pre>
  
  <p>please check one of the key <code>mr.shasta</code> had changed to <code>mr_shasta</code>.
  Can you people please provide any solution for this.</p>