Description:
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The operator precedence page (language.operators.precedence.php) lists the following operators as non-associative:

~ - (int) (float) (string) (array) (object) (bool) @

However, all of these seem to behave like right-associative operators.

Examples:
- - 3 evaluates like -(-3)) = 3
~ ~ 3 evaluates like ~(~3)) = 3
- - - 3 evaluates like -(-(-3))) = -3
~ ~ ~ 3 evaluates like ~(~(~3))) = ~3 = -4
(int) (string) 3 evaluates to integer 3
(string) (int) 3 evaluates to string "3"

It's even possible to use the @ operator more than once in front of a statement. The additional ones don't really do anything useful, but more importantly, they don't trigger any parse errors.