The factory pattern

In the factory pattern , it just like a factory , provide what you need .

This example imitate the phone factory , it produce three kind of phone .

/** * The abstract class phone * */ abstract class phone{ protected $_name; protected $_price; function __construct($name,$price){ $this->_name = $name; $this->_price = $price; } function call(){ echo "This phone is a ".get_called_class()." and name:$this->_name,and price is: $this->_price <br />"; } //we can write more function about phone } /** * iphone class extends phone * */ class iphone extends phone{ function __construct(){ parent::__construct('iphoneName',67); } //iphone function here } /** * nokia class extends phone * */ class nokia extends phone{ function __construct(){ parent::__construct('nokiaName',54); } //nokia function here } /** * HTC class extends phone * */ class HTC extends phone{ function __construct(){ parent::__construct('HTCName',98); } //HTC function here } /** * * This class use factory pattern and factory will return * various of phone class * */ class getPhone{ public static function factory($type = NULL){ switch ($type){ case 'iphone': return new iphone(); break; case 'nokia': return new nokia(); break; case 'htc': return new HTC(); break; default : //shouldn't go through this way trigger_error("sorry this phone havn't exists."); } } } $iphone = getPhone::factory('iphone'); $iphone->call();//result : This phone is a iphone and name:iphoneName,and price is: 67 $nokia = getPhone::factory('nokia'); $nokia->call(); //result : This phone is a nokia and name:nokiaName,and price is: 54 $htc = getPhone::factory('htc'); $htc->call(); //result : This phone is a HTC and name:HTCName,and price is: 98

 

 And use Lazy Loading factory to load class form diferent kind of file:

 

/** * this class achieve load page factory * */ class page{ public static function factory($class){ if (! class_exists($class)){ //include the file which contain this class type require_once $class.'.php'; } return new $class(); } }