CODEWITHSUNDEEP
boolean
Provash Shoumma
Provash Shoumma

Reputation: 461

Difference between or and xor

My question is operator related. Today I studied about the operators. Having a confusion. In PHP what is the difference between "or" and "xor". I know both of them are related to Boolean expression. But can't find the original difference.

Anyone please help to understand it more clearly.

Upvotes: 36

Views: 90646

Answers (6)

Saurav
Saurav

Reputation: 183

enter image description here enter image description here

xor is exclusive. or is inclusive

Upvotes: 1

Vincent Labrecque
Vincent Labrecque

Reputation: 324

Another way of putting it: OR can be seen as an AND/OR connector. One or both choices can be true or chosen. XOR, on the other side, could be described as a "real" OR. Only one of both choices can be true (or chosen).

Upvotes: 9

Jason McCreary
Jason McCreary

Reputation: 73031

It has to do with mutual exclusion. xor is exclusive. or is inclusive.

Truth Table Comparison

$x $y ($x or $y) ($x xor $y)
0  0    0          0
1  0    1          1
0  1    1          1
1  1    1          0

Note: the difference in the last case. xor is only true when either $x or $y is true, but not both (as the case for or).

Upvotes: 75

Jesbus
Jesbus

Reputation: 815

The difference is with an input of an even amount of 1's (or true's):

true or  true = true
true xor true = false

true or  true or  true = true
true xor true xor true = true

true or  false or  true = true
true xor false xor true = false

Truth table of OR:

  in1  |  in2  | out
-------|-------|-----
   0   |   0   |  0
   0   |   1   |  1
   1   |   0   |  1
   1   |   1   |  1

Truth table of XOR:

  in1  |  in2  | out
-------|-------|-----
   0   |   0   |  0
   0   |   1   |  1
   1   |   0   |  1
   1   |   1   |  0

Upvotes: 14

C0L.PAN1C
C0L.PAN1C

Reputation: 12243

one is exclusive or -> xor, and the other is or which means at least one of the conditions are met in a truth table. Or is not mutually exclusive, xor is.

Upvotes: 2

bengoesboom
bengoesboom

Reputation: 2147

xor means "exclusive or". That is to say, it's or, but with the single change that if both parameters to the operation are true, the answer is false.

A xor B == (A or B) && !(A and B)

Upvotes: 20

Related Questions