or

is a logical binary operation. It has the lowest priority across all binary operations.

or works on booleans and null with the following rules:

boolean logic tri-state logic

or has short-circuiting: if the first argument is true, then the second argument is not evaluated, true is returned straight away.

binary expression, `$result` will be `true`	`$result := true or false`
binary expression, `$result` will be `null`	`$result := null or null`
short-circuiting, the `expensive call` is never called, `$result` will be `true`	`$result := true or (expensive call)`
`or` is not a keyword	`print or/x # OK print "or/x" # same as previous`

See Also