i want to use a http proxy to connect to the internet via php
  $context = stream_context_create(

  $contents = file_get_contents('http://www.somesite.com/pat/to/file',
false, $context);
this is all what i need except that it gives the following error
Unable to find the socket transport "http" - did you forget to enable it when you configured PHP?
but i want to use a proxy every time i connect to the internet
for example i want to use http://magpierss.sourceforge.net/ via a proxy

moreover i want to use a socks proxy along with mail function to bypass my ISP's firewall which blocks port 25
awaiting reply