Need to think about that but I remembered after I sent my email that
I was wrong about something like "num:num" (e.g. "3:4") requiring to
start with a letter in order not to be auto-converted to a numbered
index. The reason for the confusion is the behavior of strtol() in:
print "3:4" + 1;
Which will convert "3:4" to "3".
Anyway, will think a bit more about your email and hopefully have
some more ideas by tomorrow.
Thx.
Andi
At 09:17 AM 6/4/2006, Rasmus Lerdorf wrote:
Andi Gutmans wrote:
Again, I don't think we should have a hash but a unique id which
can be used as an array key and in other things. Difference. Hash
implies that it's not unique, I'm talking about unique. So yes, I'd
take the starting point of Marcus' proposal but:
a) Make the value start with a letter so that this isn't
autoconverted but taken as a literal string key. Again, something
like "id=%p:%d"
b) Not call it hash because I see this as a unique id and not as a
hash value which is not unique necessarily.
c) This should be something outside SPL and part of the engine.
Question is again, whether it's explicit or implicit (back to the
question I had earlier). Do you just want to add a function which
returns this thing or do you want $arr[$obj] to automatically ask for it.
These are valid questions and should be answered.
I think if we implement a way to get a hash from an object, or at
least a unique identifier that can be used as a hash, then it should
be implicit just like other things are implicitly converted when the
context is clear. Of course, you should also be able to force it
explicitly. And I don't think there is any point in doing this
unless we also implicitly go the other way. From unique identifier
to object. As in:
class foo { function bar($arg) { echo $arg; } }
$obj1 = new foo;
$obj2 = new foo;
$a = array($obj1=>1,$obj2=>2);
foreach($a as $k=>$v) {
$k->bar($v);
}
Unless this works, I am not sure there is any point to all this. To
me the end goal is to make it possible to use types other than
strings and numbers as array indices which to me also means we
should look at doing the same for arrays.
-Rasmus
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