Pseudo-static rewrite rules

To obtain a pseudo static rewrite rule to achieve the function is as follows: a virtual space, three domain names want to create three sites such as http://a.comhttp: // B. comhttp: // c.com to achieve: Access: http://a.com is actually access to the virtual space root directory in: index.htm access: http:// B .com is actually seeking a pseudo static override rule
The following functions are available:

One virtual space, three domain names want to build three websites

For example

Http://a.com
Http:// B .com
Http://c.com

To achieve this:
Access: The http://a.com is actually accessing: index.htm in the virtual space root directory
Access: The http:// B .com is actually accessing the: index.htm under the virtual space root directory under the B folder
Access: The http://c.com is actually accessing the: index.htm under the c folder under the virtual space root directory


------ Solution --------------------
I just saw your message.

I don't know much about pseudo-static writing, but you can.
Directly include.

PHP code

function curPageURL(){    $pageURL = 'http';    if (isset($_SERVER["HTTPS"])&&($_SERVER["HTTPS"] == "on")) {        $pageURL .= "s";    }    $pageURL .= "://";    if ($_SERVER["SERVER_PORT"] != "80") {        $pageURL .= $_SERVER["SERVER_NAME"] . ":" . $_SERVER["SERVER_PORT"] . $_SERVER["REQUEST_URI"];    }    else {        $pageURL .= $_SERVER["SERVER_NAME"] . $_SERVER["REQUEST_URI"];    }    return $pageURL;}$url=curPageURL();switch ($url){    case 'http://a.com':        include 'index.htm';        break;    case 'http://b.com':        include './b/index.htm';        break;    default:        include 'index.htm';        break;}