Minify script is an HTTP content server. It compresses sources of content (usually files), combines the result and serves it with appropriate HTTP headers. These headers can allow clients to perform conditional GETs (serving content only when clients do not have a valid cache) and tell clients to cache the file for a period of time.
Example: http://bit.do/minify-example1
Example filter single extension (extension=html): http://bit.do/minify-example2
Example multiple extensions (extension=css,js): http://bit.do/minify-example3
Example single file (source/contato.html): http://bit.do/minify-example4
It compresses multiple files (HTML, PHP, CSS and JS) at the same time or you can filter by extension.