On Monday, February 24, 2003, at 08:12 PM, Christopher Hendry wrote:
> class B {
>
> function doSomthing()
> {
> if (class_exists('A')) {
> // here I do something, but I also want to call the increment
> method
> in class A
> // how do I get name of the object in order to reference the
> method?
> // I can hard code this in:
> $myA->increment();
> // but this is no good in the long run
> } else {
> // throw error as class A does not exist
> }
>
> }
>
> }
>
Try passing in the object by reference--that way you operate on the
object itself, not a copy.
class B
{
function doSomething(&$ObjA)
{
if (is_object($ObjA))
{
$ObjA->increment();
return true;
}
else
{
trigger_error("ObjA, she is no good", E_USER_WARNING);
return false;
}
}
}
$a->setNumber(1);
$a->increment();
echo $a->getNumber(); // echoes 2
$b = new B();
$b->doSomething($a);
echo $a->getNumber(); // echoes 3
Another, possibly more OOP, way, if you don't want to explicitly track
the name of it, is to implement the Singleton pattern in class A, and
make it a static method.
class B
{
function doSomething()
{
if (is_class('A'))
{
$ObjA =& A::singleton();
$ObjA->increment();
return true;
}
else
{
trigger_error("Class A, she is no good", E_USER_WARNING);
return false;
}
}
}
See <http://www.phppatterns.com/index.php/article/articleview/6/1/1/>
for more on how to create a singleton.
--
Sandy Smith, Senior Programmer
Forum One Communications
<ssmith@forumone.com>
http://www.forumone.com/
tel. (703) 548-1855 x28
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