sync billing phone with a custom user field called pmpro_custom_phone

pmpro_custom_phone.php

<?php

/**
 * This recipe bring Order billing info phone number into profile page.
 * 
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */



//hook into pmpro_show_user_profile action create a custom field and save into user meta
add_action( 'pmpro_show_user_profile', 'pmprocustom_show_user_profile');

/**
 * pmpro_show_user_profile action callback
 * 
 * @param WP_User $user
 * return void
 */
function pmprocustom_show_user_profile( $user ) {
	//Check if we already synced. Get field from user meta
	$pmpro_custom_phone = get_user_meta( $user->ID, 'pmpro_custom_phone', true );
	//We didn't let's get it from the last order
	$last_order = new MemberOrder();
	$last_order->getLastMemberOrder( $user->ID, array('success') );
	$phone = $last_order->billing->phone;
	//If we still don't have a phone number let's use the one from last order.
	if( ! $pmpro_custom_phone ) {
		$pmpro_custom_phone = $phone;
	}

	?>
	<div class="pmpro_form_field">
	<label class="pmpro_form_label" for="pmpro_custom_phone">Phone</label>
	<input type="text" id="pmpro_custom_phone" name="pmpro_custom_phone" value="<?php echo esc_attr( $pmpro_custom_phone ); ?>" class="pmpro_form_input pmpro_form_input-text" />
	</div>
	<?php
}

//hook into pmpro_personal_options_update action to save the custom field
add_action( 'pmpro_personal_options_update', 'pmprocustom_save_user_profile');

/**
 * Update the user meta with the custom phone field
 * 
 * @param int $user_id The user ID
 * return void
 */
function pmprocustom_save_user_profile( $user_id ) {
	update_user_meta($user_id, 'pmpro_custom_phone', $_POST['pmpro_custom_phone']);
}