variable declaration

[ksmatthews]

Hi All,

 

I recently took a php test and this question came up ...

 

What is the difference between $beer and $$beer ?

 

Both seem legal to me ....

 

Steven Matthews

[redarrow]

variable variable.

http://uk.php.net/language.variables.variable

[ksmatthews]

what is point of having Variable variables ?

 

What can they be used for ?

 

Steven Matthews

[Mark Baker]

what is point of having Variable variables ?

Use... depends on circumstance as to whether you'll ever actually need them, but they're a tool that's available for you to use or not as you choose.

$DUFF = "Homer's Favourite";
$beer = 'DUFF';
echo $$beer.' is '.$beer;

 

[Mark Baker]

Better example:

class myClass {
   private $data1 = 1;
   private $data2 = 2;

   public function __get($name) {
      return $this->$$name;
   }
}

$instance = new myClass();

echo $instance->__get('data1');