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Date: Tue, 14 Jun 2005 00:37:37 -0400
To: =?UTF-8?Q?Ondrej_Ivani=C4=8D?= <ondrej@kmit.sk>,
	Jason Garber <jason@ionzoft.com>
Subject: Re: [PHP-DEV] PHP 5.1
From: noah@botimer.net (Noah Botimer)

Ondrej and Jason,

Just pondering the proposed coalesce() variants in the context of =20
Ondrej's scenario I came upon two thoughts.

I forgot to mention the nice single parameter case of a coalesce() =20
function like this, which would return null if not set:

$x =3D coalesce($REQUEST['x']);

Also, the same characteristics could be easily preserved, as far as =20
warnings and errors, by not passing any unset variables to the =20
callback in a ucoalesce() function call:

$x =3D ucoalesce("is_number", $REQUEST['x']);

With that assertion, is_number() would only be called if the request =20
variable were set, otherwise returning null, modeling the ternary =20
expression you included, Ondrej.

Thanks,
-Noah

On Jun 14, 2005, at 12:08 AM, Ondrej Ivani=C4=8D wrote:

> Jason Garber wrote:
>
>>   ifsetor is NOT input filtering, it is not a complex, general =20
>> purpose
>>
>
> stuff like 'ifsetof()' is good when is use as:
>
>
>>   $x =3D ifsetor($ANY_var, 'Default Value');
>>
>
> but too many times I need additional checks like this:
>
> $x =3D isset($_REQUEST['x']) && is_number($x) ? $_REQUEST['x'] : null;
>
> It's possible to add additional third parameter to ifsetof() ?
>
> ifsetof(variable, expression [, callback])
>
> callback is a function which take one argument (value of variable) and
> return true or false. If return false 'expression' will be return from
> ifsetor().
>
> Usage:
>
> $x =3D ifsetor($_REQUEST['x'], null, 'is_number');
>
>
>>   It needs to be fast, and simple.
>>
>
> Hm... It's simple, but It's not very clean at first look.
>
> What's your opinion?
>
> --=20
> Ondrej Ivnaic
> (ondrej@kmit.sk)
>
> --=20
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