php - Creating randomly generated, secure token and storing in database -

i trying generate unique token every user on site. token generated when user registers, , ideally secure possble. best method of doing allow me display token user?

this token not password, , user not going create themselves. if hash , salt upon registration, not able retrieve obviously, because it's hashed , salted. want simple way via php , able display user easily.

hashes one-way way reverse hash store original value making hash redundant.

if need display value once, store value variable, print on page, , don't save it, that's secure you.

another option use database encryption store token, decrypt before displaying user. assuming use mysql might find helpul: mysql encryption