Hi,
please search the archives for "ifsetor".
johannes
On Wednesday 03 May 2006 07:56, D. Dante Lorenso wrote:
> All,
>
> I'm sure this has been asked somewhere, but since I see requests for
> features for 5.2 or 6.0, I'd like to add a "simple" item to the list
> which would be quite useful to me and would simplify and clean up a lot
> of code out there:
>
> function coalesce(...)
>
> This works much like in the SQL version of the same. In SQL, the
> function returns the first non-null argument from an arbitrary list. In
> our use, it should return the first non-empty value from the list:
>
> Example:
>
> $x = "dante";
> $y = "";
> $z = "";
>
> $value = coalesce($z, $y, $x); // $value = "dante"
>
> This function would ideally be built into the language and bypass
> warnings about undefined variables like 'empty' does. It might be nice
> to have several varieties of this function:
>
> * return first parameter where empty() is FALSE
> * return first parameter where isset() is TRUE
>
> I don't think something like this can NOT be written in userspace
> because the 'isset' and 'empty' checks need to be run before arguments
> can be passed to a user function or warnings will start flying. A
> function like this simplifies code which used to look like this:
>
> if (!empty($_POST["postkey"])) {
> $value = $_POST["postkey"];
> }
> elseif (!empty($_GET["getkey"])) {
> $value = $_POST["getkey"];
> }
> elseif (!empty($default_value)) {
> $value = $default_value;
> }
> else {
> $value = "hard coded value";
> }
>
> Into this:
>
> $value = coalesce($_POST["postkey"], $_GET["getkey"],
> $default_value, "hard coded value");
>
> Can this be built and included?
>
> Dante
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