php - How can I determine if the same user is registering again in my application? -


this question has answer here:

so, here need do. have web application have developed laravel 4, people register gain access to. use email username.

here catch though. award our users points using website, have daily cap of points, , if user goes on daily limit, capped , can't receive points no more. problem that, don't want same user register multiple times multiple email addresses , avoid cap in way.

i've thought of using cookies this, cookies can deleted. i've thought of using ip address, ip addresses change, , different users can have same ip address. so, looking more fool proof solution. ideas appreciated.

thanks!

this related stack overflow question has lot of ideas, technical rundown of various issues using unique emails, versus cookies/ip addresses this. there brief discussion of oauth further down on page.

this other stack overflow question discusses issue, , gives guidance how re-adjust thinking original app , why might want limit multiple-email signups.


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