PHP整数类型在函数调用中丢失

Question

I have some code that pulls database primary keys and iterates through them by calling a function.

When I get the key from the database and do a is_int($key) it returns true.

I then call a function: thisfunction($key)

In the calling function, I made it so that you could pass in the $key and that function loads the row for that key or you can pass the row as an object. At the beginning of the called function, it checks to see if $key is_int. It is returning false when I am calling it with an integer value.

Answer 1

Everything you get from database is string.

That means, even if you have database with INTs for columns, you are going to get them like:

id, name, age
array("43", "Rok", "19");

Answer 2

也许尝试ctype_digit（）函数。

Answer 3

由于您从数据库中获取的所有内容都是类型字符串，因此您可以尝试使用is_numeric（）而不是is_int（）。