<?php
   $outside = 'Hello';
 
   class A {
       function printme() {
           print $outside;
       }
    }
 
   $cls = new A();
   $cls->printme();
?>

function printme() {
 
           global $outside;
           print $outside;    }

$variable = "hello";
 
function printme($variable) {
 
    print $variable;
}

	class A{
		public $msg = '';
 
		public function set_msg($new_msg) {
			global $msg;
			$msg = $new_msg;
		}
	}
 
	$message = new A();
	$message->set_msg('Hello World');
	print $message->msg;

$this->msg = $new_msg;

$msg = $new_msg;