why global variables cant be accessed from within a function?

Question

global variables can be accessed from anywhere in a programme.

Answer 1

use global keyword before using them like
<?php $x=10 //is a global variable then
function func (){
global $x;
//use global keyword then these var are accessible
}
?>

Answer 2

i know this bt y it is so in php. ....y we cant use it directly

Answer 3

This maybe about scope. The $x inside the function does not know if you are talking about a local variable $x or global variable $x. So first it tries to search $x locally but there is no $x locally, hence an error occurs

Answer 4

what i didn't get u?

Answer 5

why we have to use global keyword....cant we use global variables directly

Answer 6

I'm not now