Eliminate some of our last remaining create_function() instances

* Moved some into private function callbacks
* Eliminated some that weren't necessary anymore

props obenland, markjaquith, nacin. fixes #14424
Built from https://develop.svn.wordpress.org/trunk@27373


git-svn-id: http://core.svn.wordpress.org/trunk@27222 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/import.php

@@ -15,11 +15,28 @@
  */
 function get_importers() {
 	global $wp_importers;
-	if ( is_array($wp_importers) )
-		uasort($wp_importers, create_function('$a, $b', 'return strcmp($a[0], $b[0]);'));
+	if ( is_array( $wp_importers ) ) {
+		uasort( $wp_importers, '_uasort_by_first_member' );
+	}
 	return $wp_importers;
 }
 
+/**
+ * Sorts a multidimensional array by first member of each top level member
+ *
+ * Used by uasort() as a callback, should not be used directly.
+ *
+ * @since 2.9.0
+ * @access private
+ *
+ * @param array $a
+ * @param array $b
+ * @return int
+ */
+function _uasort_by_first_member( $a, $b ) {
+	return strnatcasecmp( $a[0], $b[0] );
+}
+
 /**
  * Register importer for WordPress.
  *