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Lets assume we are talking about 32bit system.
PHP doesn’t support unsigned INT. It means that INT value should be between -2,147,483,648 and 2,147,483,647 values. And INT takes 4 bytes to store a value which are 32 bits length.
So does it mean that I have only 31 bits for value and 1 bit for sign? Or I can use whole 32 bits to store a value?
You are using the whole 32 bits. It’s just that the default output functions interpret it as signed integer. If you want to display the value “raw” use:
Since PHP handles the integers signed internally however, you can only use bit arithmetics, but not addition/multiplication etc. with them – if you expect them to behave like unsigned ints.