[每当我运行php testRabbitMQClient.php时，我都会不断收到此未捕获的错误

Question

每次运行php testRabbitMQClient.php时我都会不断收到此错误

testRMQClientPHP Fatal error:  Uncaught Error: Call to undefined function getCredentials() in /home/andrew/git/rabbitmqphp_example/testRabbitMQClient.php:20
Stack trace:
\#0 {main}
  thrown in /home/andrew/git/rabbitmqphp_example/testRabbitMQClient.php on line 20

$type = getCredentials($username,$password);