Php check similarity of multiple strings

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Algorithms for string similarities (better than Levenshtein, and similar_text)? Php, Js

I have a website that allow users to create accounts to refer others friend. And save these accounts into Database Table. But I have a problem is there's some people who create multiple account with email like [email protected], [email protected], [email protected] and so on.

Is there a way to check that in the database is these email have more that three block all these email?

I am using Php for this application.

Are you sure this is a good idea. For each one of these you block, there may be a legitimate use such as [email protected] and [email protected]. — slugonamission, Jan 31 '13 at 17:46
Yes there's a way but you will end up with lots of false positives. How will you know that `nike@...` is not someone different from `nike1@...`? — jmbertucci, Jan 31 '13 at 17:49
Because I dont want some spammers, who craete lot of emails like 1,2,3,4,5,6 and so on. — Ya Fa Su, Jan 31 '13 at 17:51
what you can try is register they ip on database and compare later. — Toping, Jan 31 '13 at 18:06

score 0 · Accepted Answer · answered Jan 31 '13 at 17:52

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Well it isn't seems to be problem actually. Because, There can be different users with slight difference in their email id.

How can you tell that user with email ids : [email protected] and [email protected] are the same that of [email protected] ?

but how ever if you want to check so :

1) You can remove the last numbers by using the regx or something similar 2) Then can check the original email id if it exists in your database.

answered Jan 31 '13 at 17:52

Vedant Terkar

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Thanks, yea maybe your guys are right. – Ya Fa Su Jan 31 '13 at 17:57

Php check similarity of multiple strings

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