note 86047 added to language.oop5.references
| From: | secure_admin at osu1 dot php dot net | Date: | Tue, 30 Sep 2008 23:38:18 +0000 |
| Subject: | note 86047 added to language.oop5.references | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-144919@lists.php.net to get a copy of this message | ||
USE OOP to ACCESS OBJECT REFERENCES
The PHP language itself offers a slew of nifty operators that can copy, clone, and alias objects and
references in many ways. But that kind of syntax looks rather fearsome. Here, I use OOP to get the
same results, but with cleaner and more practical code. Below, one DataModel object is instantiated
so that many instances of DataControl can use and alter it. Regardless of how PHP works, the OOP
styled setup keeps all DataControl instances "on the same page" because they are all
looking at the "same model" - which this code clearly shows.
<?php
class DataModel {
protected $name, $data;
public function __construct($dmName, $dmData) {
$this->name = $dmName;
$this->setData($dmData);
}
public function setData($dmData) {
if(is_numeric($dmData)) {
$this->data = $dmData;
}
}
public function __toString() {
return "DataModel [name=$this->name, data=$this->data]";
}
}
class DataControl {
protected $name, $model;
public function __construct($dcName, $dcModel) {
$this->name = $dcName;
$this->model = $dcModel;
}
public function setData($dmData) {
$this->model->setData($dmData);
}
public function __toString() {
return "DataController [name=$this->name, model=" .
$this->model->__toString() . "]";
}
}
# create one instance of DataModel...
$model = new DataModel('dm1', 128);
echo $model . '<br><br>';
# create several instances of DataControl, passing $model to each one...
$dc1 = new DataControl('dc1', $model);
$dc2 = new DataControl('dc2', $model);
$dc3 = new DataControl('dc3', $model);
echo $dc1 . '<br>';
echo $dc2 . '<br>';
echo $dc3 . '<br><br>';
# To change data, use any $dataControl->setData()...
$dc3->setData(512);
echo $dc1 . '<br>';
echo $dc2 . '<br>';
echo $dc3 . '<br><br>';
?>
* * * output * * *
DataModel [name=dm1, data=128]
DataController [name=dc1, model=DataModel [name=dm1, data=128]]
DataController [name=dc2, model=DataModel [name=dm1, data=128]]
DataController [name=dc3, model=DataModel [name=dm1, data=128]]
DataController [name=dc1, model=DataModel [name=dm1, data=512]]
DataController [name=dc2, model=DataModel [name=dm1, data=512]]
DataController [name=dc3, model=DataModel [name=dm1, data=512]]
----
Server IP: 69.147.83.197
Probable Submitter: 67.150.11.193
----
Manual Page -- http://www.php.net/manual/en/language.oop5.references.php
Edit -- https://master.php.net/note/edit/86047
Del: integrated -- https://master.php.net/note/delete/86047/integrated
Del: useless -- https://master.php.net/note/delete/86047/useless
Del: bad code -- https://master.php.net/note/delete/86047/bad+code
Del: spam -- https://master.php.net/note/delete/86047/spam
Del: non-english -- https://master.php.net/note/delete/86047/non-english
Del: in docs -- https://master.php.net/note/delete/86047/in+docs
Del: other reasons-- https://master.php.net/note/delete/86047
Reject -- https://master.php.net/note/reject/86047
Search -- https://master.php.net/manage/user-notes.php