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Predefined Constants	Object overloading Functions

	Last updated: Thu, 26 Jun 2008

Examples

Some simple examples on using the overload() function:

Example #1 Overloading a PHP class


<?php



class OO {

   var $a = 111;

   var $elem = array('b' => 9, 'c' => 42);



   // Callback method for getting a property

   function __get($prop_name, &$prop_value) 

   {

       if (isset($this->elem[$prop_name])) {

           $prop_value = $this->elem[$prop_name];

           return true;

       } else {

           return false;

       }

   }



   // Callback method for setting a property

   function __set($prop_name, $prop_value) 

   {

       $this->elem[$prop_name] = $prop_value;

       return true;

   }

}



// Here we overload the OO object

overload('OO');



$o = new OO;

echo "\$o->a: $o->a\n"; // print: $o->a: 111

echo "\$o->b: $o->b\n"; // print: $o->b: 9

echo "\$o->c: $o->c\n"; // print: $o->c: 42

echo "\$o->d: $o->d\n"; // print: $o->d:



// add a new item to the $elem array in OO

$o->x = 56; 



// instantiate stdclass (it is built-in in PHP 4)

// $val is not overloaded!

$val = new stdclass;

$val->prop = 555;



// Set "a" to be an array with the $val object in it

// But __set() will put this in the $elem array

$o->a = array($val);

var_dump($o->a[0]->prop);



?>

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Predefined Constants	Object overloading Functions

	Last updated: Thu, 26 Jun 2008

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