Como podría hacerlo?
Código PHP:
<?php
/*
note:
this is just a static test version using a hard-coded countries array.
normally you would be populating the array out of a database
the returned xml has the following structure
<results>
<rs>foo</rs>
<rs>bar</rs>
</results>
*/
$aUsers = array(
"Zaun, Jillie"
);
$aInfo = array(
"Bedfordshire"
);
$input = strtolower( $_GET['input'] );
$len = strlen($input);
$limit = isset($_GET['limit']) ? (int) $_GET['limit'] : 0;
$aResults = array();
$count = 0;
if ($len)
{
for ($i=0;$i<count($aUsers);$i++)
{
// had to use utf_decode, here
// not necessary if the results are coming from mysql
//
if (strtolower(substr(utf8_decode($aUsers[$i]),0,$len)) == $input)
{
$count++;
$aResults[] = array( "id"=>($i+1) ,"value"=>htmlspecialchars($aUsers[$i]), "info"=>htmlspecialchars($aInfo[$i]) );
}
if ($limit && $count==$limit)
break;
}
}
header ("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past
header ("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); // always modified
header ("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header ("Pragma: no-cache"); // HTTP/1.0
if (isset($_REQUEST['json']))
{
header("Content-Type: application/json");
echo "{\"results\": [";
$arr = array();
for ($i=0;$i<count($aResults);$i++)
{
$arr[] = "{\"id\": \"".$aResults[$i]['id']."\", \"value\": \"".$aResults[$i]['value']."\", \"info\": \"\"}";
}
echo implode(", ", $arr);
echo "]}";
}
else
{
header("Content-Type: text/xml");
echo "<?xml version=\"1.0\" encoding=\"utf-8\" ?><results>";
for ($i=0;$i<count($aResults);$i++)
{
echo "<rs id=\"".$aResults[$i]['id']."\" info=\"".$aResults[$i]['info']."\">".$aResults[$i]['value']."</rs>";
}
echo "</results>";
}
?> 
