I can give you a rough idea to do that. If you need to identify similar type of text, than you can use similar_text() php function. Than you set a benchmark that how many percentage you will allow. If similarities is more than 50%, than you can say that is a similar post.

Ref: http://php.net/manual/en/function.similar-text.php

Of course, there are few other ways to solve this one.

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