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.


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).