Description:
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faultCode1faultStringWarning:set_exception_handler() expects the argument (exception_handler) to be a valid callback in C:\WebServers\htdocs\count\new\test.php on line 6

<line 6>  if(DEBUG) set_exception_handler('exception_handler');

  function exception_handler(Exception $ex){
    $str_time = $ex->getFile() .":". $ex->getLine() ." ". htmlentities($ex->getMessage()) ." (". $ex->getCode() .") [". get_class($ex) ."]\r\n";
    echo $str_time;
  }

Test script:
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if(DEBUG) set_exception_handler('exception_handler');

  function exception_handler(Exception $ex){
    $str_time = $ex->getFile() .":". $ex->getLine() ." ". htmlentities($ex->getMessage()) ." (". $ex->getCode() .") [". get_class($ex) ."]\r\n";
    echo $str_time;
  }