electroteque wrote:
On 29/01/2005, at 12:02 AM, Jochem Maas wrote:
classes cannot be defined as static - defining them as abstract has
the effect
of being able to only use a given class statically (unless you
subclass it and the subclass
is not abstract).
abstract as in it is the final base class ?
no abstract as in 'cannot be instantiated'
try running the following:
abstract class MyClass
{
public function __construct()
{
echo "boo!";
}
}
$mc = new MyClass;
the 'final' keyword is used to declare that a class or method cannot be
overridden by (or in) a subclass.
variables inside it, or its only meant to stay in the one static
method so
yes you can use variables - but not member variables because $this is
not defined in functions
that are declared static - bare in mind you can call a method
statically even though its not
marked as static (just be sure you don't reference $this).
i meant member vars , what is the point of static methods anyway ?
difficult question. a start would be to say that static methods offer
a neat way to organise your code (sort of cheapmans namespace).
PHP5 also offers static class vars:
abstract class MyClass
{
static private $val;
static public function set($v)
{
self::$val = $v;
}
static public function speak()
{
if (!is_null(self::$val)) {
echo self::$val."\n";
} else {
echo "<silence>\n";
}
}
}
MyClass::set("yeah");
MyClass::speak();
sidenote: the php4 trick of overwriting $this does not work in PHP5.
that i cant live with
good ;-) ... the reason it doesn't work is the same reason PHP5 objects are soooo
much cooler, namely a rewritten object model. thank the gods!
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