EDIT . Based on the addition of "maybe this is not very" conditional ", but I want my personal" link "pages to appear in the google index, and then registration is required to register the page." To the question: You can check the User Agent in your php code to basically allow google to see pages if he was a registered user (Google agent for Google is “Googlebot / 1.0”, and you can search to find user agents for others common engines).
However, this behavior is specifically against google rules, and they can and will remove your site from the index if they catch you on it. Their policy is that you should not treat googlebot differently than any random person who visits your site.
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