RE: [PHP] about __get,__set Overloading, read-only properties

My idea is just your answer...happy..ing ^_^ You are so warmhearted. Thanks a lot! : ) I will never post a question to a existing thread . > -----Original Message----- > From: Jochem Maas [mailto:jochem@iamjochem.com] > Sent: Friday, December 21, 2007 9:11 AM > To: ked > Cc: php-general@lists.php.net > Subject: Re: [PHP] about __get,__set Overloading, read-only properties > > pleae don't reply to an existing thread when posting a new question. > > ked schreef: > > Hi. all , > > > > I got a article from php 5.0 manual's comments. It's useful, offer > > readonly properties for classes. > > > > (look at the end of this message for the article ) > > > > find out function __construct(), I want to modify > $this->id in it , > > then I got a "readonly" Exception (defined in "__set" function). > > > > Distinctly, a read-only property could not be change via > > "$obj->attribute = '' " , but is could be change via > $this->id='', > > inside of class , isn't it ? > > > > How to modify __set function ? > > don't - let __set() be the policeman it's supposed to be. > either create a private function to initialize values or set > the values directly in the array > > private function init($k, $v) > { > if (isset($this->p_arrPublicProperties[$k])) > $this->p_arrPublicProperties[$k]['value'] = $v; } > > > > > thanks for any advises. > > > > regards! > > ked > > > > > > the article is here: > > > ---------------------------------------------------------------------- > > ------ > > ------------------------ > > Eric Lafkoff (22-Feb-2006 02:56) > > > > If you're wondering how to create read-only properties for > your class, > > the > > __get() and __set() functions are what you're looking for. You just > > have to create the framework and code to implement this > functionality. > > Here's a quick example I've written. This code doesn't take > advantage > > of the "type" attribute in the properties array, but is > there for ideas. > > <?php > > class Test > > { > > private $p_arrPublicProperties = array( > > "id" => array("value" => 4,"type" => > > "int","readonly" => true), > > "datetime" => array("value" => "Tue 02/21/2006 > 20:49:23","type" => > > "string", "readonly" => true), > > "data" => array("value" => "foo", "type" > > => "string", > "readonly" => > > false) > > ); > > > > //ked add!!!!!!! > > public function __construct() > > { > > $this->id = 100; //----------------------------will get > exception !! > > } > > > > private function __get($strProperty) { //Get a property: > > if (isset($this->p_arrPublicProperties[$strProperty])) { return > > $this->p_arrPublicProperties[$strProperty]["value"]; > > } else { > > throw new Exception("Property not defined"); return false; } } > > > > private function __set($strProperty, $varValue) { //Set a > property to > > a value: > > if (isset($this->p_arrPublicProperties[$strProperty])) { //Check if > > property is read-only: > > if ($this->p_arrPublicProperties[$strProperty]["readonly"]) { throw > > new Exception("Property is read-only"); > > ///////////////////////////////////---------------note here return > > false; } else { > $this->p_arrPublicProperties[$strProperty]["value"] = > > $varValue; return true; } } else { throw new > Exception("Property not > > defined"); return false; } } > > > > private function __isset($strProperty) { > > //Determine if property is set: > > return isset($this->p_arrPublicProperties[$strProperty]); > > } > > > > private function __unset($strProperty) { > > //Unset (remove) a property: > > unset($this->p_arrPublicProperties[$strProperty]); > > } > > > > } > > $objTest = new Test(); > > print $objTest->data . "\n"; > > $objTest->data = "bar"; //Works. > > print $objTest->data; > > $objTest->id = 5; //Error: Property is read-only. > > ?> > > > > -- > PHP General Mailing List (http://www.php.net/) To > unsubscribe, visit: http://www.php.net/unsub.php > > >