If you control your own Apache server and just want to shortcut to "go away" instead of feeding scrapers, the RewriteEngine is your friend, for example:

      RewriteEngine On

      # Block requests that reference .php anywhere (path, query, or encoded)
      RewriteCond %{REQUEST_URI} (\.php|%2ephp|%2e%70%68%70) [NC,OR]
      RewriteCond %{QUERY_STRING} \.php [NC,OR]
      RewriteCond %{THE_REQUEST} \.php [NC]
      RewriteRule .* - [F,L]

Notes: there's no PHP on my servers, so if someone asks for it, they are one of the "bad boys" IMHO. Your mileage may differ.