//pseudo code

$GLOBALS['obj'] = new myObj(); // create my object
global $obj; // make it global?

$obj->set_env($value); // works fine

function test {
 $obj->set_env($value2); // Doesn't work, produces below error.
}

//error: Fatal error: Call to a member function set_env() on a non-object

// test() is called from inside another function.