Workaround for XML-RPC bug in PHP 5.2.2

[kelson]

I'm not sure if this is even appropriate here, since it's not really WordPress' fault, but there's a bug in PHP 5.2.2 that prevents XMLRPC from working properly. Basically, $HTTP_RAW_POST_DATA is never set, even when called via POST or with the config option set to always be on.

It's possible to work around it in WP 2.2 by adding one line to the beginning of WordPress' xmlrpc.php file, right before the first mention of the variable.

$HTTP_RAW_POST_DATA = file_get_contents("php://input");

It's apparently fixed in the PHP CVS, but who knows how long it'll be before 5.2.3 comes out.

Anyway, I don't know if you'll want to include a workaround for a single-version bug (though this is the most current "stable" release) or what impact this would have running on other versions of PHP, but I thought I'd post it just to convey the info.

•  My experience troubleshooting the issue
•  A post that identified the cause
•  PHP Bug 41293

I'm thinking we should fix this. Hosts, at least in my experience, aren't really known to upgrade when a new release comes out, at least right away. Besides, I don't think it hurts fixed versions of PHP, does it?

A comment in the PHP bug linked to in the description has this exact same fix.

Oh, and the guy confirmed it worked, too.

(In [5445]) Fix for PHP version 5.2.2 where $HTTP_RAW_POST_DATA isn't set. fixes #4248

I'd like to champion this ticket for 2.2 inclusion.

Why:

• By the time 2.3 ships most hosters will still run PHP 4.x or live on the edge and run on >= 5.2.3. This fix will not help many people any more then, because they're not affected.
  
• When 2.2 is released 5.2.2 is used by the people living on the edge. Therefore this fix actually helps a lot of people.

(In [5452]) Fix for PHP version 5.2.2 where isn't set. fixes #4248 for 2.2