Once a variable is set, its scope is set globally; that is, it can be referenced later in the code to display the output, or used in conditional expressions. However, variables can also be changed after they have been set. For example, a promotion end date is set from a field in a Sendable Data Extension using a personalization string, but for specific customers, there is a requirement to adjust this value later in the code:<\/p>\n
%%[\n\nvar @promotionEndDate, @memberStatus\nset @promotionEndDate = '10\/15\/2018'\nset @memberStatus = status\n\nif @memberStatus == 'gold' then\n set @promotionEndDate = '11\/15\/2018'\nendif\n\n]%%<\/code><\/pre>\nVariables can also be set on themselves in a function; that is, if the variable has previously been declared, then it can be used as an argument to a function, based on its previous value. So the above code could also be expressed as:<\/p>\n
%%[\n\nvar @promotionEndDate, @memberStatus\nset @promotionEndDate = '10\/15\/2018'\nset @memberStatus = status\n\nif @memberStatus == 'gold' then\n set @promotionEndDate = DateAdd(@promotionEndDate, 1, 'M')\nendif\n\n]%%<\/code><\/pre>\nAlso, once a variable has been set, it can be reset by declaring the value again. In the example below, if the current date is less than (after) a membership end date, then a null<\/code> value will be set for membership status.<\/p>\n%%[\n\nvar @membershipEndDate, @memberStatus\nset @membershipEndDate = '10\/15\/2018'\nset @memberStatus = status\n\nif @membershipEndDate > Now() then\n var @memberStatus\nendif\n\n]%%<\/code><\/pre>\n