Ticket #13317: 13317-negative-values-equal-zero.2.patch

wp-includes/pluggable.php

@@ -103 +103 @@
 function get_userdata( $user_id ) {
         global $wpdb;
 
-        if ( ! is_numeric( $user_id ) )
+        if ( ! is_scalar( $user_id ) )
                 return false;
                 
-        $user_id = absint( $user_id );
+        $user_id = max( 0, (int) $user_id );
         if ( ! $user_id )
                 return false;