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Sorry if this question seems a little basic for some of you, but my programming knowledge leaves a lot to be desired, to say the least!

What I would like to know is this: When a request is made to my web server, how do I detect the version of HTTP that the requesting user-agent supports (i.e. HTTP/1.0 or HTTP/1.1)? The server-side scripting language that my server uses is PHP version 5.2.

Basically, I would like to use PHP to do something like this:

if(/* user agent is currently using HTTP/1.1 */) { // do this... } else { // do something else... }

I would be very grateful if somebody could point me in the right direction. Thanks in advance!

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The superglobal $_SERVER variable generally contains this kind of information. In this case, you're interested in the SERVER_PROTOCOL entry:

if($_SERVER['SERVER_PROTOCOL'] == 'HTTP/1.1'){ // Client is using HTTP/1.1 } else { // Client is using a different protocol (likely HTTP/1.0) }
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$_SERVER['SERVER_PROTOCOL'] has it's problems... See stackoverflow.com/q/17640877/632951
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You can use $_SERVER['SERVER_PROTOCOL']:

'SERVER_PROTOCOL'
Name and revision of the information protocol via which the page was requested; i.e. 'HTTP/1.0';

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Firstly, thanks for your speedy response, Gumbo. I did actually consider $_SERVER_PROTOCOL, but for some reason I thought the value it returned was what my server used? So, am I now right in thinking that the value of $_SERVER_PROTOCOL corresponds to the requesting user-agent?
@clarky_y2k: Yes, SERVER_PROTOCOL is the protocol that the client used in the current request. Just try an HTTP/1.0 request and see the difference.
@clarky_y2k: variable $_SERVER_PROTOCOL is deprecated in new PHP vresions, use $_SERVER['SERVER_PROTOCOL'] instead it
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$_SERVER['SERVER_PROTOCOL'] will have the version of HTTP by which the page was requested. link.

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