Development environment: The development environment is a server specially used by programmers for development. The configuration can be more casual. For the convenience of development and debugging, all error reports are generally opened.
Test environment: generally clone a configuration of the production environment. If a program does not work properly in the test environment, it must not be released to the production machine.
Production environment: It is the value of officially providing external services. Generally, the error report will be turned off and the error log will be turned on.
The three environments can also be said to be the three stages of system development: development -> testing -> online, where the production environment is usually the real environment!