mutes expected warnings and notices deliberately generated by Smarty

Description

string

muteExpectedErrors

muteExpectedErrors() registers a custom error handler using 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 registered any custom error handlers after the muteExpectedErrors() call, the unmute will not remove Smarty\'s muting error handler, but the one registered last.