(Need help) Beginner's question

[Sachin Raut <imsachinraut@xxxxxxxxx>]

Hi

I have a question in this following code.
<?php

class A

{

    public $country;

     function __construct($data=array())

    {

       if(!isset($data))

       {

       trigger_error("Couldn't construct address with a ".get_class());

       }

    }

}

 $obj=new A();

?>

I am not sending any "array" as an argument while creating an object. And
hence "if statement" in constructor should have been executed, but it
displays blank page. My query is why it's not executing "if statement"?

Thanks
Sachin