(PHP 5, PHP 7, PHP 8)
is_soap_fault — Checks if a SOAP call has failed
   This function is useful to check if the SOAP call failed, but
   without using exceptions. To use it, create a
   SoapClient object with the 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.
  
objectThe object to test.
   This will return true on error, and false otherwise.
  
示例 #1 is_soap_fault() example
<?php
$client = new SoapClient("some.wsdl", array('exceptions' => 0));
$result = $client->SomeFunction();
if (is_soap_fault($result)) {
    trigger_error("SOAP Fault: (faultcode: {$result->faultcode}, faultstring: {$result->faultstring})", E_USER_ERROR);
}
?>
示例 #2 SOAP's standard method for error reporting is exceptions
<?php
try {
    $client = new SoapClient("some.wsdl");
    $result = $client->SomeFunction(/* ... */);
} catch (SoapFault $fault) {
    trigger_error("SOAP Fault: (faultcode: {$fault->faultcode}, faultstring: {$fault->faultstring})", E_USER_ERROR);
}
?>