Description:
------------
It is impossible to generate <struct> responses from associative arrays with numeric and non-zero-based keys.

I was hoping to see either:

* php string keys are converted to <struct> even if they have numeric value. 
Example: array('123'=>'abc') becomes 

<struct><name>123</name><value>abc</value></struct>

* all non-zero-based and non-sequential array keys are converted to <struct>.

For example:

array('a','b','c') becomes:
<array><value>a</value><value>b</value><value>c</value></array>

array('a',3=>'b','5'=>'c') becomes:
<struct>
  <name>0</name><value>a</value>
  <name>3</name><value>b</value>
  <name>5</name><value>c</value>
</struct>

* output option that would automatically convert all arrays to <struct> type. 

I was looking into extension source, and found that within determine_vector_type and PHP_to_XMLRPC_worker a variable and test with simple 0 based index should be simple enough, however somehow zend_hash_get_current_key doesn't detect the initial type of array key correctly. Of course converting it to *char would be possible, but i'm not sure if it's the correct way.


Workarounds found in comments of bug #37746 is to process return array in recursive way and add chr(0) at end of each numeric key, but that is ugly and slow. Example for workaround:

  function xmlrpc_fix_numeric_keys($data) {
    $result = array();
    if (!is_array($data)) return $data;
    foreach ($data as $k=>$v) {
      if (is_numeric($k)) $k=$k.chr(0);
      $result[$k]=xmlrpc_fix_numeric_keys($v);
    }
    return $result;
  }



Reproduce code:
---------------
  $test = array('333'=>'ddd','9212'=>'asd');
  $rpc = xmlrpc_encode($test);
  echo $rpc;



Expected result:
----------------
<?xml version="1.0" encoding="utf-8"?>
<params>
<param>
 <value>
  <struct>
   <member>
    <name>333</name>
    <value>
     <string>ddd</string>
    </value>
   </member>
   <member>
    <name>9212</name>
    <value>
     <string>asd</string>
    </value>
   </member>
  </struct>
 </value>
</param>
</params>


Actual result:
--------------
<?xml version="1.0" encoding="utf-8"?>
<params>
<param>
 <value>
  <array>
   <data>
    <value>
     <string>ddd</string>
    </value>
    <value>
     <string>asd</string>
    </value>
   </data>
  </array>
 </value>
</param>
</params>