On cs, 2007-02-01 at 10:53 -0500, Robert Cummings wrote:
> On Thu, 2007-02-01 at 16:42 +0100, Roman Neuhauser wrote:
> >
> > If PHP was statically typed, global variables would still be a bad
> > smell. They are bad smell in C++ and Java, for example. It's too easy
> > to call getfoo() before you have set up $foo. The risk grows
> > exponentially: as soon as you add another global, $bar, you risk that
> > you or someone else will use getfoo() inside initbar(), and getbar()
> > inside initfoo() (or getfoo() inside initfoo()). Of course, it will be
> > several function calls deep, and quite probably only happen in a code
> > path that's rarly used (such as error handling).
>
> Nopthing wrong with globals as long as they aren't used to punt data
> around from function to function. I find globals quite useful when used
> for configuration. I usually use a double level array. The first index
> is a grouping index such as "someProject" the second index is the name
> of the property. I could use a database table, but why incur an extra
> query. I could use a class, but why increase complexity, I could use
> functions, but complexity again.
I greatly agree with this. I use config arrays, and put all
initialization which sets up the elements of the config arrays in an
include file which is included everywhere.
And inside functions these config arrays are my only globals (besides
the superglobals of course).
greets
Zoltán Németh
> As for singletons... just use a static
> class method.
>
> <?php
>
> class Foo extends Singleton
> {
> function Foo()
> {
> static $createdAlready = false;
>
> if( $createdAlready )
> {
> die( 'Use Foo::getGlobalInstance() instead.' );
> }
>
> $createdAlready = true;
> }
>
> function getGlobalInstance()
> {
> static $singleton = null;
>
> if( $singleton === null )
> {
> $singleton = &new Foo();
> }
>
> return $singleton;
> }
> }
>
> ?>
>
> Now how hard was that!?
>
> Cheers,
> Rob.
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