related to #1693 changed smarty version to 4.1.0

include/smarty/docs/programmers/api-functions/api-mute-expected-errors.md

@@ -0,0 +1,21 @@
+Smarty::muteExpectedErrors()
+
+mutes expected warnings and notices deliberately generated by Smarty
+
+Description
+===========
+
+string
+
+muteExpectedErrors
+
+muteExpectedErrors() registers a custom error handler using
+[set\_error\_handler()](&url.php-manual;set_error_handler). The error
+handler merely inspects `$errno` and `$errfile` to determine if the
+given error was produced deliberately and must be ignored, or should be
+passed on to the next error handler.
+
+`Smarty::unmuteExpectedErrors()` removes the current error handler.
+Please note, that if you\'ve registerd any custom error handlers after
+the muteExpectedErrors() call, the unmute will not remove Smarty\'s
+muting error handler, but the one registered last.