title: how to capitalize first character of sub array keys
body: <pre><code>Array
  (
  [Carriers] =&gt; Array
      (
          [Carrier] =&gt; Array
              (
                  [0] =&gt; Array
                      (
                          [carriersid] =&gt; a2e01423-2e8f-4458-8c13-2bfd08591d75
                          [phonenumber] =&gt; 1234567890
                          [network] =&gt; CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA
                          [wireless] =&gt; True
                          [zipcode] =&gt; 92675
                          [city] =&gt; Capistrano Valley
                          [price] =&gt; 3.0000
                          [createddate] =&gt; 2016-02-19 06:18:56
                      )
  </code></pre>
  
  <p>I want to capitalize [carriersid] to Carriersid.
  I know array_change_key_case function is there but it only make keys either UPPERCASE or LOWERCASE.
  Anyhelp is much appreciated. :)</p>