Re: [PHP] Constant questions
On 12-May-2004 René Fournier wrote:
> Hi,
>
> I have two questions involving Constants.
>
> 1. I want to refer to a refer to a Constant by its value (which is
> unique), and return its name. E.g.,:
>
> define ("SEND_DS","1");
> define ("SEND_DS_ACK","2");
> define ("RESEND_DS","3");
> define ("STARTUP_DS","12");
>
> For example, if I receive "3", I would like to echo "RESEND_DS"--the
> name of the constant. Is there a simply way to do this? Or am I
> better
> using an Associative Array (which is what I was thinking)? Then I
> could
> such refer to an element by its key or value (both of which are
> unique).
Both.
get_defined_constants()
array_flip()
Regards,
--
Don Read [EMAIL PROTECTED]
-- It's always darkest before the dawn. So if you are going to
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Re: [PHP] Constant questions
* Thus wrote Ren Fournier ([EMAIL PROTECTED]):
> Hi,
>
> I have two questions involving Constants.
>
> 1. I want to refer to a refer to a Constant by its value (which is
> unique), and return its name. E.g.,:
>
> define ("SEND_DS","1");
> define ("SEND_DS_ACK","2");
> define ("RESEND_DS","3");
> define ("STARTUP_DS","12");
>
> For example, if I receive "3", I would like to echo "RESEND_DS"--the
> name of the constant. Is there a simply way to do this? Or am I better
> using an Associative Array (which is what I was thinking)? Then I could
> such refer to an element by its key or value (both of which are
> unique). I suppose this more of a performance/elegance issue, than
> outright problem. Just curious what you think.
Constants are more for the programmer to use within the program to
avoid hard coding arbitrary numbers embeded deep inside code.
You can use a combination of both Constants and arrays to achive
your task:
define('SEND_DS', 1);
define('SEND_DS_ACK', 2);
...
$lookup = array(
SEND_DS => 'SEND_DS',
SEND_DS_ACK => 'SEND_DS_ACK',
);
Curt
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Re: [PHP] Constant questions
Hello René, Wednesday, May 12, 2004, 6:29:13 PM, you wrote: RF> Such that the output will be MY_NAME. If I echo $val, the output will RF> be Rene. But I want to see the constants Name, not Value. Any ideas? No easy way I can think of, but you could do: $array = get_defined_constants(); and then search $array for your value, returning the key if found. -- Best regards, Richard Davey http://www.launchcode.co.uk / PHP Development Services http://www.phpcommunity.org/wiki/296.html / PHP Community -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Constant questions
Hi,
I have two questions involving Constants.
1. I want to refer to a refer to a Constant by its value (which is
unique), and return its name. E.g.,:
define ("SEND_DS","1");
define ("SEND_DS_ACK","2");
define ("RESEND_DS","3");
define ("STARTUP_DS","12");
For example, if I receive "3", I would like to echo "RESEND_DS"--the
name of the constant. Is there a simply way to do this? Or am I better
using an Associative Array (which is what I was thinking)? Then I could
such refer to an element by its key or value (both of which are
unique). I suppose this more of a performance/elegance issue, than
outright problem. Just curious what you think.
2. Let's say I have a Constant called MY_NAME, the value of which is
"Rene", and I pass it to a function, such as:
function example ($val) {
echo ???;
}
example (MY_NAME);
Such that the output will be MY_NAME. If I echo $val, the output will
be Rene. But I want to see the constants Name, not Value. Any ideas?
Thanks.
...Rene
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