i created a counter that with any refresh incrase 1 unit of record in database for counting number of vitors that visited of site.
but one person maybe refresh again and incrase that record.
what is the soloution to perevent this ?
( i don't want to use the last vistior IP to check if the next vistor is him then perevnt to incrase counter. because some pepoles maybe use of invalid IP (all of them have 1 one valid IP))