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webmaster is crawling both the urls, one which is SEO friendly and the one .php urls for the same page thus showing duplicate title and description for those pages.
urls of .php were changed through .htaccess file. what is the solution?
You should be doing a 301 redirect from the .php URLs to the rewritten URLs. If that is not possible for some reason you need to add a canonical URL to the .php URL pointing to the rewritten URL.
Required, but never shown