unable to call global variables inside a function class - php

Question

I am new to PHP5 and classes, am struggling with being able to get global variable to work when inside a function, to better explain it please check the code bellow.
class alpha{
#first function
public function n_one(){
#variable
$varr = 1;
#inner function
function n_two(){
global $varr;
#Unable to get variable
echo $varr;
if($varr)
{
echo 'yessssss';
}
}
echo $varr // Returns variable fine
}
}
I seem to be doing something wrong violating how classes and functions work, can't figure what is it.

Answer 1

Move the 'inner function', and the property.
class Alpha
{
private $varr = 1;
public function n_one()
{
// to access a property ore another method, do this
$this->varr = $this->doSomething();
return $this->varr; // Returns variable fine
}
private function doSomething()
{
// manipulate $this->varr here
}
}
Also, don't ever echo from within the class, instead return the variable and echo it.
echo $alpha->n_one();

Answer 2

global means to access the variable in the global scope, not just the containing scope. When you refer to $varr in the inner function it's treated as $GLOBALS['varr'].
If you want it to refer to the same variable as in the outer function you need to declare the variable global there as well. Otherwise it's a local variable in that function, while the inner function accesses the global variable.
#first function
public function n_one(){
global $varr;
#variable
$varr = 1;
#inner function
function n_two(){
global $varr;
#Unable to get variable
echo $varr;
if($varr)
{
echo 'yessssss';
}
}
echo $varr // Returns variable fine
}
Alternatively you can use the use() declaration to declare a variable that should be inherited from the outer scope.
#inner function
function n_two() use($varr) {
global $varr;
#Unable to get variable
echo $varr;
if($varr)
{
echo 'yessssss';
}
}