Re: PHP OOP
| From: | Tom Rogers | Date: | Thu, 02 Oct 2003 00:46:21 +0000 |
| Subject: | Re: PHP OOP | ||
| References: | 1 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-164649@lists.php.net to get a copy of this message | ||
Hi,
Wednesday, October 1, 2003, 9:00:18 AM, you wrote:
GH> I'm working for the first time with object orientated programming in php and
GH> I can't figure out how to access elements or methods when you place objects
GH> inside objects inside other objects.
GH> my origonal idea was to use the following syntax:
$a->>b->c
GH> but this just returns:
$a->>b . "->c"
GH> Please, need advice on the finer points of OOP in PHP
if you have this
class a {
var $var_a = 'A';
function a ($var){
$this->$var_a = $var;
}
function get_var(){
return $this->var_a;
}
}
class b {
var $a = '';
function b ($var){
$this->$a = new a($var);
}
function get_var(){
return $this->a->get_var();
}
}
$class_b = new b("Hello');
You can access class a directly with
$class_a_var = $class_b->a->var_a;
but this relies on you knowing the structure of your classes. (note we drop the
$ after the ->)
What is better is to use the black box method and make access functions in each
class and do
$class_a_var = $class_b->get_var();
This way we can change how class a works and not worry about how it stores its
data. With this method if we change the variable name in class a to $new_a the
code will still work, where as $class_b->a->var_a will now fall in a heap.
Hope this helps
--
regards,
Tom