When you are generating your PHP website it will ask you if you want to store the password in the generated site so users will not be prompted. So long as you do not select to store the password your users will always be prompted to log in. Attached are some screenshots of examples.
Attached is a second screen shot of the option i was refering to.
Have a good day! Happy developing!
Thank you! That worked. I must have set it to store. Much appreciated.