Error Handling Message

<?php

include './ccxt.php';

date_default_timezone_set('UTC');

$exchange = new \ccxt\bittrex(array(
   'apiKey' => 'foo',
   'secret' => 'bar',
));

$message = null;

try {

   $result = $exchange->fetch_balance ();
   var_dump ($result);

// these catch-clauses are showing the proper way of handling the errors

} catch (\ccxt\AuthenticationError $e) {

   // handle authentication error here

} catch (\ccxt\NetworkError $e) {

   // your code to handle the network code and retries here

} catch (\ccxt\ExchangeError $e) {

   // your code to handle an exchange error

} catch (Exception $e) {

   // This is an example of how NOT TO DO error handling
   // One should not rely on the message string contained in the exception
   // If you want to access it, that might indicate a design error in your code.
   // See: https://github.com/ccxt/ccxt/issues/3053

   $message = $e->getMessage();

   if (preg_match ('/[a-z]+\s+(\{.+\})$/iu', $e->getMessage(), $matches)) {
       $message = $matches[1];
   }

   echo print_r ($message, true) . "\n";

}

?>