This function is useful when you like to check if the SOAP call failed, but don't like to use exceptions. To use it you must create a SoapClient object with exceptions option set to zero or FALSE. In this case, the SOAP method will return a special SoapFault object which encapsulates the fault details (faultcode, faultstring, faultactor and faultdetails).
If exceptions is not set then SOAP call will throw an exception on error. is_soap_fault() checks if the given parameter is a SoapFault object.
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