On Wed, 2007-04-25 at 21:23 +0800, Man-wai Chang wrote:
> where can I find the documentation about this "symbol"?
Maybe in the documentation? A cursory glance from me though didn't turn
anything up. Either way I can inform you of the purpose...
The following two expression have the same result:
$foo = 5;
${'foo'} = 5;
The difference being that the code between { and } is first evaluated to
determine the name of the variable. $foo is preferred and faster but
there may be the odd time when you find doing something like the
following useful:
${'foo_'.$i} = $someValue;
So let's imagine $i = 3, then a variable called $foo_3 has been created
and can even be accessed as $foo_3.
If you are familiar with variable variables then you may be aware that
the above can also be achieved as follows:
$name = 'foo_'.$i;
$$name = $someValue;
Cheers,
Rob.
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