The product ID and customer ID can contain alphanumericdata and, therefore, will have a string type.
产品ID和客户ID可以包含文字数字数据,因此将为string类型。
2
This piece of code takes up tainted data from the user, ensuring protection as it checks that the characters to be printed are only alphanumeric characters and Spaces.
The first element of simplicity found in Twitter is the amount of information you are able to enter as data, which is limited to 140 alphanumeric characters.