MivaScript Builtin Function, Miva Merchant 9+
miva_member_exists( structure var, member ) <mvt:assign name="g.return_value" value="miva_member_exists( structure var, member )" />
Tests if a member exists where: "structure" is a data structure and "member" is the name of a structure member being tested. Returns 0 or 1.
A data structure or structured array that is tested. It is passed by reference to the function.
The literal member name or a variable that evaluates as the member name.