Example why you should use type hinting in php where applicable.

gistfile1.aw

<?php

class User {
  
}

function setUserName(User $user, $new_username) {
  $user->Profile->setUserName($new_username);
}

function setUsername1($user, $new_username) {
  $user->Profile->setUserName($new_username); 
}

// Catchable fatal error: Argument 1 passed to setUserName() must be an instance
// of User, array given, called in FILE on line N and defined in FILE on line N
setUserName(array(), 'Logan');

//Trying to get property of non-object in FILE on line N
//Fatal error: Call to a member function setUserName() on a non-object in FILE on line N
setUserName1(array(), 'Logan');