Why are my variables going out of scope? PHP

Question

Language is PHP 5.4 on an Apache 2.2 server. It\'s a script being called by ajax.

$usr = new User();

function getMyName(){
    echo $usr->username;
}
getMyNa         


        

Answer 1

$usr = new User();

function getMyName(){
    global $usr;
    echo $usr->username;
}
getMyName();

alternatively:

$usr = new User();

function getMyName($usr){
    echo $usr->username;
}
getMyName($usr);