and

is a logical binary operation. It has higher priority than or, and has lower priority than all the other binary operations.

and works on booleans and null with the following rules:

boolean logic tri-state logic

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

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

See Also