title: INT max size for 32bit system
body: <p>Lets assume we are talking about 32bit system.</p>
  
  <p>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.</p>
  
  <p>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?</p>