SOAP-ERROR: Encoding: string ... is not a valid utf-8 string
What about change the encoding settings:
SERVER:
$server = new SoapServer("some.wsdl", array('encoding'=>'ISO-8859-1')); // for 'windows-1252' too
CLIENT:
$server = new SoapClient("some.wsdl", array('encoding'=>'ISO-8859-1')); // for 'windows-1252' too
... then the conversion is done automatically to UTF-8, I had the similiar problem, so this helped me, so it is tested
Today I run into same problem - the code which caused that problem was:
$request->Text = substr($text, 0, 40);
changing substr to mb_substr seems to solve the issue:
$request->Test = mb_substr($text, 0, 40, 'utf8');
The problem is that í != i. Try to convert your string to UTF-8 before using in a request. It may look like that:
$string = iconv('windows-1252', 'UTF-8', $string);
See http://php.net/iconv