How do I match only file names in an unordered file with grep?

I tried grep -Po '[a-zA-Z1-9/_-]{1,}\.php' ( I am trying to match php files), but that doesn't work for e.g http://www.google.com/index.php, because it matches com/index.php. It also needs to catch things like /directory/subdirectory/index.php



my text http://www.google.com/index.php /bla.php my end

result: "http://www.google.com/index.php" and "/bla.php"

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