note 86047 added to language.oop5.references

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]]
----
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Probable Submitter: 67.150.11.193
----
Manual Page -- http://www.php.net/manual/en/language.oop5.references.php
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