Weird encoding issue in API call

Question

I'm retrieving from Odoo 9 on Ubuntu 14.04 ENG a list of partners via XML-RPC using PHP and ripcord.
Some names contain one or more diacritics:
Pièr
Frère Pièr
All those names have been entered from a single computer running Windows 8.1 using one version of Chrome.
The strange fact is that I get a list where some diacritics are correct, some other have encoding problems, like:
Pi�r
Fr�re Pièr
The same diacritic in the same string is correctly encoded or not.
In subsequent calls the result is alw

Raffaele · Accepted Answer

I found out that the incoming array was in charset "Latin1"
I solved normalizing the array generated from the XML-RPC output, recursively applying a multbyte conversion function:
// given an XML-RPC output named $arr_output...
function descramble_diacritics(&$entry, $key) {
$entry = mb_convert_encoding($entry, 'UTF-8', 'Latin1');
}
array_walk_recursive($arr_output, 'descramble_diacritics');
header('Access-Control-Allow-Origin: *');
header('Content-Type: application/json');
echo json_encode($arr_

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