* ctype
* iconv
* json
-* mbstring
+* mbstring (new requirement in 1.27)
* xml
The following PHP extensions are strongly recommended:
* openssl
like changing a password.
** Two new globals, $wgChangeCredentialsBlacklist and $wgRemoveCredentialsBlacklist
can be used to prevent the web UI and the API changing certain authentication data.
+* The file upload dialog (available if you install WikiEditor or VisualEditor)
+ can now be configured using $wgUploadDialog.
=== External library changes in 1.27 ===