Re: [PHP] Re: __get, __set, __clone

[Marek Kilimajer]

Yann Larrivee wrote:

Hi Greg, thanks for the example. I think i now understand a bit more.

I just need a confirmation on this

$table->FirstName = 'Greg';
$table->LastName = 'Beaver';
This will actually call __set and it will create a member variable named
FristName with the value Greg.
Not necessarily. __set is called only if it is defined. You can 
implement __set the way that you will throw an error if FirstName is 
being set to 'Greg':

class Table {
        private $properties;
        function __set($name, $value) {
                switch($name) {
                        case 'FirstName':
                                if($value=='Greg') {
                                        echo "Table: Warning: Greg is forbidden here!";
                                        return;
                                }
                                if($value=='') {
                                        echo "Table: Warning: FirstName cannot be 
empty!";
                                        return;
                                }
                                break;
                        default:
                                echo "Table: Warning: Unknown property '$name'!";
                                return;
                }
                $this->properties[$name]=$value;
        }
}

And if you call $table->FirstName and it is not set it will return false
right ?
Again, here is called the __get method (if defined). And again if 
implemented, it can return anything.



SO what are the advantages to use __get, __set.

You have more control over the state of your object, your properties 
cannot be set to something you don't want. You can also create 
properties on the fly with the __get method.

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