PHPDoc for FormEngine::getTSCpid() is invalid
This method returns an array bug PHPDoc says it returns an integer.
[CLEANUP] Improve code style for FormEngine::getTSCpid()
The PHPDoc is fixed. The method returns an array and not an integer.
Additionally the class variable that is used in this method for
storing the cached values is added as a property.
Reviewed-by: Tymoteusz Motylewski
Tested-by: Tymoteusz Motylewski
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn