global scope in a Class

Hi guys,

Just started learning PHP (I already have some experience with other OOP languages) and got to a point where I am a bit confused.
It is a global keyword(?), which I am confused about.I understand thta in php there are function scopes, so variables in a function are in local scope and variables outside the function are "global" variables which are accessible through the global keyword(?).
Is the code below correct than:
<? php
public class TestClass
{
private $_var = 'global variable';

function Display1()
{
global $_var;
echo $_var;
}
//or can I use this way too?
function Display2()
{
echo $this->_var;
}
}
?>

Thanks for any clarification.
Ben

 

Seems you're a little confused here

$_var was declared within the class so it's owned by the class and is not actually of global scope. So you may reference it using $this->_var within an function in the class

This would change if you had $myglobalvar = 5; outside of the class then wanted to access it. In that case you'd need to use the global keyword.

Of course globals are frowned upon so if you needed the var it's always best to pass it as a parameter opposed to saying global in the function.

 

Hi InFloW,

Thank you for your clarification, as I said I am newbie in PHP and got the global stuff wrongly.
Cheers

Ben