On Fri, Nov 10, 2006 at 12:55:45PM +0100, Sebastian Bergmann wrote:
> Dmitry Shirokov wrote:
> > <?php
> > function foo()
> > {
> > return array(1,2,3,4,5,6);
> > }
> >
> > echo foo()[4]; // <---- it that
> > // or may be (foo())[4] ?
> >
> >
> > // instead of
> > $var = foo();
> > echo $var[4];
> > ?>
>
> Although I am not a huge fan of method chaining in general (see [1]),
> I am happy to have it in PHP as it faciliates fluent interfaces [2].
>
> I makes IMHO perfect sense to also allow a similar syntax for arrays.
> But the implementation should be closed (in the mathematical sense), so
> that $o->m()[0]->n() also works, for instance, when m() returns an
> array that has an object with method n() at index 0.
Also constants, eg:
$numDays = array(31,28,31,30,31,30,31,31,30,31,30,31)[$month];
Any expression has type & value and you should be able to apply any
operator that is appropriate to that type regardless of where the
value comes from, be that: variable, literal, function, expression.
So all of the following should work:
$monthLength = array(31,28,31,30,31,30,31,31,30,31,30,31);
$numDays = $monthLength[$month];
$numDays = array(31,28,31,30,31,30,31,31,30,31,30,31)[$month];
$numDays = array_merge(array(31,28,31,30,31,30),
array(31,31,30,31,30,31))[$month];
$numDays = $months->lengths[$month];
Only the first one currently does.
Expressions should also work, thus:
$f = ('abcd' . 'efgh'){5};
I looked up the precedence table (
http://www.php.net/manual/en/language.operators.php ) to see if I
would need parenthesis in $months->lengths[$month] (perhaps
($months->lengths)[$month]) but
-> is not listed as an operator in the precedence table. Please can someone put
it in!
> --
> [1] http://en.wikipedia.org/wiki/Law_of_Demeter
> [2] http://www.martinfowler.com/bliki/FluentInterface.html
--
Alain Williams
Parliament Hill Computers Ltd.
Linux Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer.
+44 (0) 787 668 0256 http://www.phcomp.co.uk/
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