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I am considering a change to a site that requires a small amount of PHP to be placed in each file. The php should not affect anything, since it is just to supply the html pages with some new data. BUUT, the owner currently occupies 1st position ranking on many searches and is terrified that the modification will cause this to change. they are afraid that as dot php files, the search engines will not bother to search through them.
Will this change the ratings?