重定向到主页（如果在Google中单击）

Question

I've read a several ways to redirect users to homepage, but, what if I need to redirect them just if they got to that page through a search engine like Google or Bing.

I need this because I'm building a cigar webpage and in some countries is demanded to be a certain age to view the content.

Answer 1

You could set a cookie or session through PHP/JavaScript on the first website visit, and check on all upcoming visits if the cookie already exists. If not, redirect them to the homepage.

Answer 2

In PHP you can use the function:

$_SERVER['HTTP_REFERER'];

I believe this will also retrieve the full URL you was referred from.

See: http://php.net/manual/en/reserved.variables.server.php

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Ignore the above answer as I read the question wrong. Best thing to do would be store within a session. If a session key exists then do not redirect, if it doesn't then do a redirect.

<?php
session_start();
$_SESSION['existingUser'] = true;

print_r($_SESSION);
?>