Pre-populate Woocommerce checkout fields

woo-checkout.php

<?php
/**
 * Pre-populate Woocommerce checkout fields
 * Note that this filter populates shipping_ and billing_ fields with a different meta field eg 'first_name'
 */
add_filter('woocommerce_checkout_get_value', function($input, $key ) {

	global $current_user;

	switch ($key) :
		case 'billing_first_name':
		case 'shipping_first_name':
			return $current_user->first_name;
		break;
		
		case 'billing_last_name':
		case 'shipping_last_name':
			return $current_user->last_name;
		break;

		case 'billing_email':
			return $current_user->user_email;
		break;

		case 'billing_phone':
			return $current_user->phone;
		break;

	endswitch;

}, 10, 2);



/**
 * Dynamically pre-populate Woocommerce checkout fields with exact named meta field
 * Eg. field 'shipping_first_name' will check for that exact field and will not fallback to any other field eg 'first_name'
 *
 * @author Joe Mottershaw | https://cloudeight.co
 */
add_filter('woocommerce_checkout_get_value', function($input, $key) {
	
	global $current_user;
	
	// Return the user property if it exists, false otherwise
	return ($current_user->$key
		? $current_user->$key
		: false
	      	);
}, 10, 2);