Description:
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I either don't understand why the [] operator is claimed to 
be right-associative, or there's a documentation error 
(http://ca.php.net/operators)

On that page, the following is claimed:

Operator: []
Associativity: Right

From my understanding of the online documentation, that 
means that for the following code:

<?php
$c = $a[1][2];
?>

The following "precedence" tree would be used:

1. [2]
2. [1]
3. =

But obviously it would be processed more like this:

1. [1]
2. [2]
3. =

The reasoning being that PHP needs to know what array you're 
accessing an index for, so the starts from the and goes on 
to the right.  If it started with [2], then it doesn't know 
what array to access yet until it accesses the next operator 
and says "oh ok, let's get index 2 from $a[1]".  So needless 
to say I am a little confused by the documentation?

In my mind, [] should either be non-associative or at least 
left-associative?

Now, I only just thought that it might be referring to 
nested []:

<?php
$a = $b[$c[1]];
?>

But in my mind, anything within [...] is a whole expression 
unto itself.  ie:

<?php
$a = $b[strtolower($c[1]) . '-stuff'];
?>

So I can understand where [] can be right-associative when 
nested, but in my mind [] is more closely related to () than 
anything else. () forces precedence, and everything inside 
of the () has not relation/cares to anything outside of it, 
same with [].  Anything inside the [] has nothing to do with 
anything outside of it.

Anyway, I just thought the documentation was possibly 
unclear on this, and I think it could be because of the 
complication of the [] compared to other operators.  For a 
final example:

<?php
$a = $b = 1;
$a[$b[1]];
?>

In both cases the operand precedence goes from 1 => $b => 
$a.  The operands are in the same order, but the [] wraps 
around the operands, whereas all the other operators do not.  
I think this could be the cause of the confusion or lack of 
specific examples/documentation on the website.

In any case, I think there should at least be some 
clarification, or maybe I am completely misunderstanding the 
[] operator?  I would hope not since I'm a fairly 
experienced PHP developer, but in any case I will admit that 
I may have the whole thing completely wrong!

Reproduce code:
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n/a

Expected result:
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n/a

Actual result:
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n/a