On 9/12/09 9:50 AM, "Tom Worster" <fsb@xxxxxxxxxx> wrote:
> On 9/12/09 1:32 AM, "Lars Torben Wilson" <torben@xxxxxxx> wrote:
>
>> Tom Worster wrote:
>>> if i have an expression that evaluates to an object, the return value from a
>>> function, say, and i only want the value of one of the objects properties,
>>> is there a tidy way to get it without setting another variable?
>>>
>>> to illustrate, here's something that doesn't work, but it would be
>>> convenient if it did:
>>>
>>> $o = array( (object) array('a'=>1), (object) array('a'=>2) );
>>>
>>> if ( end($o)->a > 1 ) { // can't use -> like this!
>>> ...
>>> }
>>
>> What version of PHP are you using? Your example should work.
>>
>> Torben
>
> 5.2.9.
>
> what version does it work in?
i shamefully beg your pardon, lars. i was sure i tested the example but it's
clear to me now i either didn't or i made a mistake. end($o)->a IS php
syntax! so -> may follow a function (or method, i guess) call.
but let me give you a more different example:
$a and $b are normally both objects, each with various members including a
prop q, but sometimes $a is false. i want the q of $a if $a isn't false,
otherwise that of $b.
($a ? $a : $b)->q // is not php, afaik
before you suggest one, i know there are simple workarounds.
but mine is a theoretical question about syntax, not a practical one. i'm
exploring php's syntactic constraints on the -> operator in contrast to,
say, the + or . operators. and in contrast to other languages.
for example, the . in js seems more generally allowed than -> (or, for that
matter, []) in php. programmers (especially using jquery) are familiar with
using . after an expression that evaluates to an object, e.g.
<body>
<p id="thepara" class="top x23 indent">My x class number is
<span id="num"></span></p>
<div id="mandatory" style="border: solid red 1px"></div>
<script type="text/javascript">
document.getElementById('num').innerText =
( ( document.getElementById('optional')
|| document.getElementById('mandatory')
).appendChild(document.getElementById('thepara'))
.className.match(/x(\d+)/) || [0,'absent']
)[1]
</script>
</body>
which shows . after objects, method calls and expressions (as well as the []
operator applied to an expression).
do we just live without in phpville or am i missing something?
and while i'm at it, and using my original error, how come...
function o() { return (object) array('q'=>7); }
echo o()->q; // is ok syntax, but
function a() { return array('q'=>5); }
echo a()['q']; // isn't?
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