Best way to use class methods in PHP - php

Question

I wanted to get opinions on the "best" way of using class methods in PHP.
I've always believed this is the better way:
class Customer {
public $customer_id;
public $name;
public $email;
public function __construct( $defaults = array() ) {
foreach ( $defaults as $key => $value ) {
if ( property_exists( $this, $key ) ) {
$this->{ $key } = $value;
}
}
}
public function get( $customer_id ) {
$row = ... // Get customer details from database
if ( $row ) {
$this->customer_id = $customer_id;
$this->name = $row['name'];
$this->email = $row['email'];
else {
throw new Exception( 'Could not find customer' );
}
// Don't return anything, everything is set within $this
}
public function update() {
// No arguments required, everything is contained within $this
if ( ! $this->customer_id ) {
throw new Exception( 'No customer to update' );
}
... // Update customer details in the database using
// $this->customer_id,
// $this->name and
// $this->email
}
}
Methodology #1. The class would then be used like this:
$customer = new Customer();
// Get the customer with ID 123
$customer->get( 123 );
echo 'The customer email address was ' . $customer->email;
// Change the customer's email address
$customer->email = 'abc#zyx.com';
$customer->update();
Methodology #2. However, I see most CodeIgniter examples, and WordPress examples, use this type of methodology:
$customer = new Customer();
// Get the customer with ID 123
$cust = $customer->get( 123 );
echo 'The customer email address was ' . $cust->email;
$cust->email = 'abc#zyx.com';
$customer->update( array( 'customer_id' => 123, 'email' => $cust->email ) );
The second example involves the get method returning a copy of the object, and the update method requires arguments passing in rather than working with $this
I can't help feeling the first example is cleaner and better but perhaps I'm overlooking something?
PS: Please ignore the fact the above examples don't use namespaces, setters, getters, etc, I've trimmed them down to the minimum for illustrative purposes.