Description:
------------
In special circunstances, the funcion xmlrpc_encode_request may do wrong numeric entities convertions. 

This occur when the escaping is set to "non-ascii" (this is on by default) and when the xml data has any caracter which ascii code % 10 < 10 (ex: 202,203,204, so on). 

Reproduce code:
---------------
$request_xml = xmlrpc_encode_request( "method" , Array( "?emec" ) , Array( "version" => "xmlrpc" ) ) ;
print( $request_xml ) ;


Expected result:
----------------
<?xml version="1.0" encoding="iso-8859-1"?>
<methodCall>
<methodName>teste</methodName>
<params>
 <param>
  <value>
   <string>&#209;emec</string>
  </value>
 </param>
</params>
</methodCall>


Actual result:
--------------
<?xml version="1.0" encoding="iso-8859-1"?>
<methodCall>
<methodName>teste</methodName>
<params>
 <param>
  <value>
   <string>&#29;emec</string>
  </value>
 </param>
</params>
</methodCall>