// Reorder Checkout Fields
add_filter('woocommerce_checkout_fields','reorder_woo_fields');

function reorder_woo_fields($fields) {
$fields2['billing']['billing_email'] = $fields['billing']['billing_email'];
$fields2['billing']['billing_first_name'] = $fields['billing']['billing_first_name'];
$fields2['billing']['billing_last_name'] = $fields['billing']['billing_last_name'];
$fields2['billing']['billing_country'] = $fields['billing']['billing_country'];
$fields2['billing']['billing_address_1'] = $fields['billing']['billing_address_1'];
$fields2['billing']['billing_address_2'] = $fields['billing']['billing_address_2'];
$fields2['billing']['billing_city'] = $fields['billing']['billing_city'];
$fields2['billing']['billing_postcode'] = $fields['billing']['billing_postcode'];
$fields2['billing']['billing_state'] = $fields['billing']['billing_state'];
$fields2['billing']['billing_phone'] = $fields['billing']['billing_phone'];

$fields2['shipping']['shipping_first_name'] = $fields['shipping']['shipping_first_name'];
$fields2['shipping']['shipping_last_name'] = $fields['shipping']['shipping_last_name'];
$fields2['shipping']['shipping_country'] = $fields['shipping']['shipping_country'];
$fields2['shipping']['shipping_address_1'] = $fields['shipping']['shipping_address_1'];
$fields2['shipping']['shipping_address_2'] = $fields['shipping']['shipping_address_2'];
$fields2['shipping']['shipping_city'] = $fields['shipping']['shipping_city'];
$fields2['shipping']['shipping_postcode'] = $fields['shipping']['shipping_postcode'];
$fields2['shipping']['shipping_state'] = $fields['shipping']['shipping_state'];


// Add full width Classes and Clears to Adjustments
$fields2['billing']['billing_email'] = array(
    'label'     => __('Email', 'woocommerce'),
    'required'  => true,
    'class'     => array('form-row-wide'),
    'clear'     => true
);
$fields2['billing']['billing_phone'] = array(
    'label'     => __('Phone', 'woocommerce'),
    'required'  => false,
    'class'     => array('form-row-wide'),
    'clear'     => true
);

return $fields2;
}