After upgrading PHP from 5.3 to 5.6, when logging into the website, the PHP code returned is not the login interface. Does anyone know?

Question

After upgrading php from 5.3 to 5.6, when logging in to the website, the php code returned is not the login interface. Does anyone know?

Answer 1

Found it. After upgrading, I forgot to change the configuration file.

Answer 2

The server is not parsing the php file?