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. 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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