====== caseSerial() ====== ''string **caseSerial**()'' The function ''caseSerial()'' returns the value saved in the data record in the variable ''SERIAL''. This is useful, for example, if you would like to show the respondent a personalized link to another questionnaire. * If the participant was invited via [[:en:survey:mailing|Mailing]], ''caseSerial()'' returns the personal ID of the participant. * If an access code was used to begin the questionnaire (either transferred in the [[:en:survey:url|Link]] or entered manually), this will be returned when ''caseSerial()'' is used. **Note:** An access code in the link to the questionnaire is saved regardless of whether the the questionnaire can only be accessed with an access code, or if it is public. To tranfer an ID that is not an access code, it is better to use the reference designed for this purpose. ===== Example ===== **Note:** If you are using mailings, normally the function ''[[:en:create:functions:mailschedule|mailSchedule()]]'' is more effective than the following example. If necessary, read the chapter [[:de:survey:opt-in-live|Multi-Wave Surveys with Self-Selection]].


html('
  Please access this
  
  questionnaire next week!
');

The access code or the personal ID is also available with the [[:en:create:placeholders|placeholder]] %caseSerial% . The following PHP code has the same purpose a the code above.


html('
  Please access this
  
  questionnaire next week!
');