From: Kaspar Schiess <eule@...>
Date: 2004-07-04T18:49:17+09:00
Subject: Re: Problem with "eval"

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Dirk Einecke wrote:

| Hi.
|
| I've a id and a value. Now I want a variable with id as name and the
| content from value as value of this variable. I tryed like this:
|
|   id = 'foo'
|   value = 'This is the value.'
|   eval "$#{id} + ' = ' + #{value}"    # -> $id = 'This is the value.'
|
| But this is not working. What's wrong? Is there a better/faster way?
|
| greetings
| Dirk Einecke
|
|
Hello Dirk,

~  eval %Q{ $#{id} = #{value.inspect} }

will work for value being string values (and some others)..

And you will probably get to hear that this is insecure and has numerous
problems. Setting these variables as elements of a hash or open struct
is better design - of course your mileage may vary.

(If you are not told by others here, you might have a look at why PHP
does not do auto-creation of global variables anymore..)

kaspar

semantics & semiotics
code manufacture

www.tua.ch/ruby
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