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I am kind of curious, how does a hosting server support multiple users with php but keep each user away from the other code? The 'easy' solution i thought were file permissions. So every user can have www-data belong to their group and the server would have executing access but the users cant access the others file.

But then i realize the user running the php would be www-data who has permission to read everyones data. So how does a shared host prevent this from happening?

PS: I personally use nginx (with fastcgi php). But i am somewhat familiar on how apache works.

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2 Answers 2

most of them use apache module mod_userdir : http://httpd.apache.org/docs/2.0/mod/mod_userdir.html

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PHP has a basedir configuration that will limit each virtualhost to a sub-folder.

See http://stackoverflow.com/questions/2781185/php-a-different-open-basedir-per-each-virtual-host

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