Index: wp-includes/compat.php
===================================================================
--- wp-includes/compat.php	(revision 6351)
+++ wp-includes/compat.php	(working copy)
@@ -2,37 +2,6 @@
 
 /* Functions missing from older PHP versions */
 
-
-/* Added in PHP 4.2.0 */
-
-if (!function_exists('floatval')) {
-	function floatval($string) {
-		return ((float) $string);
-	}
-}
-
-if (!function_exists('is_a')) {
-	function is_a($object, $class) {
-		// by Aidan Lister <aidan@php.net>
-		if (get_class($object) == strtolower($class)) {
-			return true;
-		} else {
-			return is_subclass_of($object, $class);
-		}
-	}
-}
-
-if (!function_exists('ob_clean')) {
-	function ob_clean() {
-		// by Aidan Lister <aidan@php.net>
-		if (@ob_end_clean()) {
-			return ob_start();
-		}
-		return false;
-	}
-}
-
-
 /* Added in PHP 4.3.0 */
 
 function printr($var, $do_not_echo = false) {
@@ -64,40 +33,6 @@
 		define('CASE_UPPER', 1);
 }
 
-
-/**
- * Replace array_change_key_case()
- *
- * @category    PHP
- * @package     PHP_Compat
- * @link        http://php.net/function.array_change_key_case
- * @author      Stephan Schmidt <schst@php.net>
- * @author      Aidan Lister <aidan@php.net>
- * @version     $Revision$
- * @since       PHP 4.2.0
- * @require     PHP 4.0.0 (user_error)
- */
-if (!function_exists('array_change_key_case')) {
-		function array_change_key_case($input, $case = CASE_LOWER)
-		{
-				if (!is_array($input)) {
-						user_error('array_change_key_case(): The argument should be an array',
-								E_USER_WARNING);
-						return false;
-				}
-
-				$output   = array ();
-				$keys     = array_keys($input);
-				$casefunc = ($case == CASE_LOWER) ? 'strtolower' : 'strtoupper';
-
-				foreach ($keys as $key) {
-						$output[$casefunc($key)] = $input[$key];
-				}
-
-				return $output;
-		}
-}
-
 if (!function_exists('http_build_query')) {
 	function http_build_query($data, $prefix=null, $sep=null) {
 		return _http_build_query($data, $prefix, $sep);