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SOAP-ERROR: Encoding: string … is not a valid utf-8 string

I have a web service built using the Zend Framework. One of the methods is intended to send details about an order. I ran into some encoding issue. One of the values being returned contains the following:

 productname™

 The webservice is returning the following fault:

 SOAP-ERROR: Encoding: string 'productname\xc3...' is not a valid utf-8 string

 Solution ::::

  the code which caused that problem was:

 $value['name'] = substr($_product->getName(), 0, 40);

 changing substr to mb_substr seems to solve the issue:
$value['name'] = mb_substr($_product->getName(), 0, 40, 'utf8');
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