GitHub was sending data differently than I expected.

simensen · simensen · commit 641c69894e13 · 2013-01-12T23:03:17.000-08:00
diff --git a/web/subsplit-webhook.php b/web/subsplit-webhook.php
@@ -18,7 +18,7 @@
     exit;
 }
 
-$body = file_get_contents('php://input');
+$body = $_POST['payload'];
 
 $redis = new Predis\Client();
 

Original file line number	Diff line number	Diff line change
`@@ -18,7 +18,7 @@`
`18`	`18`	`exit;`
`19`	`19`	`}`
`20`	`20`
`21`		`-$body = file_get_contents('php://input');`
	`21`	`+$body = $_POST['payload'];`
`22`	`22`
`23`	`23`	`$redis = new Predis\Client();`
`24`	`24`