Accessing dynamic links in the format of domain.com/<dynamic_page_name>

What could possibly work is, to have a special subdomain for yhose user created pages, so your URLs would be user.domain.com/page_name and then use mod_rewrite to rewrite user.domain.com/page_name to www.domain.com/userpagecontroller/page_name

Then you don't need checks if that page_name is in fact a user created page, or some other page.

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