Classes and variables

[mihkel100]

Why is it necessary to define variables inside class?
Here are two classes which do the same thing.

class number_1{
    # the variable is defined
    var $something;

function something(){
    $this->something='Hello<br />';
    echo $this->something;
}
}

$print = new number_1;
$print->something();

#############

class number_2{
   # the variable isn't defined

function something(){
    $this->something='Hello';
    echo $this->something;

}
}

$print2 = new number_2;
$print2->something();

The result is:

Hello
Hello

[ZibingsCoder]

It isn't necessary. It's just safer programming practices. You can create almost entirely dynamic classes using this, and can even add dynamic function calls if you use the variables correctly.