ID: 34073 Updated by: [EMAIL PROTECTED] Reported By: phpbugs at majiclab dot com -Status: Open +Status: Closed Bug Type: Documentation problem Operating System: n/a PHP Version: Irrelevant New Comment:
This bug has been fixed in the documentation's XML sources. Since the online and downloadable versions of the documentation need some time to get updated, we would like to ask you to be a bit patient. Thank you for the report, and for helping us make our documentation better. Previous Comments: ------------------------------------------------------------------------ [2005-08-10 18:53:36] phpbugs at majiclab dot com Description: ------------ 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: --------------- n/a Expected result: ---------------- n/a Actual result: -------------- n/a ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=34073&edit=1
