(i) Outputting images
(ii) Pdf files
(iii) And even Flash movies( using generated on the fly)
(iv) You  can also output any text, such as XHTML an any other XML file
(v) PHP can autogenerate these files and save them in the file system
(vi)instead of printing it(these files)  coupons out,forming a server side cache for your
your dynamic  content.

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