Am 12.03.2015 um 05:17 schrieb Levi Morrison:
> On Wed, Mar 11, 2015 at 6:10 PM, Rowan Collins <[email protected]>
> wrote:
>> On 11/03/2015 23:21, Johannes Ott wrote:
>>>
>>> So now I want to do my first own proposal for a new function in PHP and
>>> I hope doing it right with starting a discussion here first.
>>>
>>> The purpose of this suggestion is to introduce a static constructor,
>>> which is called before the first call to class either static or
>>> non-static to initialize some static properties which are needed by the
>>> class.
>>
>>
>> Can you give an example use case for when this would be useful? I'm
>> struggling to think of one for which there isn't already an established
>> coding pattern...
>
> Notably, user-land enums. You don't want public constructors because
> you don't want it instantiated except for each enum property. You also
> need it to run on class creation, not afterwards.
>
> I think we'd be better off adding language-level enums than static
> constructors though.
>
Yes indeed user-land enums are one of the use cases I use this feature
at the moment. But there some other use cases as well:
1. Nearly all of my classes have a static LogAdapter $LOG which has to
be intialized with Classname once.
class A {
private static $LOG;
public static function __static() {
self::$LOG = LogAdapter::getLogger(self::class);
}
} A::__static();
The LogAdapter by it selfs although have a __static() method to prepare
the Log4PHP-Framework I'm using.
2. Some Config classes which are intelligent wrapper-classes to some
ini-files and database have to read in some things first.
class Config {
private static $ini;
public static function __static() {
self::$ini = parse_ini_file(...);
// or
// Read from Database
}
} Config::__static();
3. For a multilanguage system I determine the user language by useragent
and fallback to default-language if user language ist not supported.
class Text {
private static $defaultLang;
private static $userLang;
public static function __static() {
self::$defaultLang = //read from Database
self::setUserLanguageOrFallback();
}
private static function setUserLanguageOrFallback() {
...
}
} Text::__static();
4. Already prepare some PDO-statements which needed all over the class
class Example {
private static $stmts = [];
public static function __static() {
self::$stmts['select1'] = new DBSelect('SELECT * FROM table WHERE
`col1`=:clause');
}
} Example::__static();
That are the examples I can found on a quick search over my code.
Regards,
--
DerOetzi
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