mb_check_encoding Check if the string is valid for the specified encoding &reftitle.description; boolmb_check_encoding stringvar&null; stringencodingmb_internal_encoding() Checks if the specified byte stream is valid for the specified encoding. It is useful to prevent so-called "Invalid Encoding Attack". &reftitle.parameters; var The byte stream to check. If it is omitted, this function checks all the input from the beginning of the request. encoding The expected encoding. &reftitle.returnvalues; &return.success;