Add a shipping email/phone field to checkout and notify of new orders

woocommerce-shipping-contact.php

<?php
/*
Plugin Name: WooCommerce Shipping Contact
Plugin URI: https://github.com/helgatheviking/wc-shipping-contact
Description: Add a shipping email field to checkout and notify of new orders
Version: 1.1.0
Author: Kathy Darling
Author URI: http://kathyisawesome.com
Requires at least: 4.0
Tested up to: 4.8
WC Version: 3.5.0

Copyright: © 2016 Kathy Darling.
License: GNU General Public License v3.0
License URI: http://www.gnu.org/licenses/gpl-3.0.html

*/


/**
 * The Main WC_Shipping_Contact class
 **/
if ( ! class_exists( 'WC_Shipping_Contact' ) ) :

class WC_Shipping_Contact {

	/**
	 * @var WC_Shipping_Contact - the single instance of the class
	 * @since 1.0
	 */
	protected static $_instance = null;           

	/**
	 * Main WC_Shipping_Contact Instance
	 *
	 * Ensures only one instance of WC_Shipping_Contact is loaded or can be loaded.
	 *
	 * @static
	 * @see WC_Shipping_Contact()
	 * @return WC_Shipping_Contact - Main instance
	 * @since 1.0
	 */
	public static function instance() {
		if ( is_null( self::$_instance ) ) {
			self::$_instance = new self();
		}
		return self::$_instance;
	}

	/**
	 * Cloning is forbidden.
	 *
	 * @since 1.0
	 */
	public function __clone() {
		_doing_it_wrong( __FUNCTION__, __( 'Cloning this object is forbidden.', 'wc-shipping-contact' ), '1.0' );
	}

	/**
	 * Unserializing instances of this class is forbidden.
	 *
	 * @since 1.0
	 */
	public function __wakeup() {
		_doing_it_wrong( __FUNCTION__, __( 'Unserializing instances of this class is forbidden.', 'wc-shipping-contact' ), '1.0' );
	}
  
	/**
	 * WC_Shipping_Contact Constructor
	 *
	 * @access public
     * @return WC_Shipping_Contact
	 * @since 1.0
	 */

	public function __construct() { 

		$this->email_id = 'email';
		$this->email_meta = '_shipping_email';
		$this->email_label = __( 'Shipping Email', 'wc-shipping-contact' );
		$this->phone_id = 'phone';
		$this->phone_meta = '_shipping_phone';
		$this->phone_label = __( 'Shipping Phone', 'wc-shipping-contact' );

		// add fields to checkout
		add_filter( 'woocommerce_shipping_fields' , array( $this, 'add_shipping_fields' ) );
		// add emails to admin order view
		add_filter( 'woocommerce_admin_shipping_fields' , array( $this, 'admin_shipping_fields' ) );
		
		// add recipient to specific emails
		add_filter( 'woocommerce_email_recipient_customer_processing_order' , array( $this, 'add_recipient' ), 20, 2 );
		add_filter( 'woocommerce_email_recipient_customer_completed_order' , array( $this, 'add_recipient' ), 20, 2 );
		add_filter( 'woocommerce_email_recipient_customer_note' , array( $this, 'add_recipient' ), 20, 2 );
		
		// display meta key in order overview
		add_action( 'woocommerce_order_details_after_customer_details' , array( $this, 'after_customer_details' ) );
		
		// display meta key in email
		add_action( 'woocommerce_email_customer_details' , array( $this, 'email_after_customer_details' ), 15, 3 );

    }


	/*-----------------------------------------------------------------------------------*/
	/* Plugin Functions */
	/*-----------------------------------------------------------------------------------*/

	/**
	 * Add email to front-end shipping fields
	 *
	 * @var  array $fields
	 * @return  array
	 * @since 1.0
	 */
	
	function add_shipping_fields( $fields ) {
		$fields['shipping_' . $this->email_id] = array(
			'label' 		=> $this->email_label,
			'required' 		=> true,
			'class' 		=> array( 'form-row-first' ),
			'validate'		=> array( 'email' ),
		);
		$fields['shipping_' . $this->phone_id] = array(
			'label' 		=> $this->phone_label,
			'required' 		=> false,
			'type'		=> 'tel',
			'class'    	=> array( 'form-row-last' ),
			'clear'    	=> true,
			'validate' 	=> array( 'phone' ),
		);
		return $fields;
	}

	/**
	 * Add email to Admin Order overview
	 *
	 * @var  array $fields
	 * @return  array
	 * @since 1.0
	 */
	function admin_shipping_fields( $fields ) {
		$fields[$this->email_id] = array(
			'label' 		=> $this->email_label
		);
		$fields[$this->phone_id] = array(
			'label' 		=> $this->phone_label,
			'wrapper_class' => '_shipping_state_field' // borrow a class from WC that will float it right
		);
		return $fields;
	}

	/**
	 * Add recipient to emails
	 *
	 * @param  str $email, comma-delimited list of addresses
	 * @param  obj WC_Order $order
	 * @return  str
	 * @since 1.0
	 */
	function add_recipient( $email, $order ) {

		$additional_email = get_post_meta( $order->get_id(), $this->email_meta, true );

		if( $additional_email && is_email( $additional_email )){
			$email = explode( ',', $email );
			array_push( $email, $additional_email );
			$email = implode(",", $email);
		}
		return $email;
	}

	/**
	 * Display meta in my-account area Order overview
	 *
	 * @var  object $order
	 * @return  null
	 * @since 1.0
	 */

	public function after_customer_details( $order ){
		
		$email = get_post_meta( $order->get_id(), $this->email_meta, true );
		
		if( $email ){
			echo '<dt>' . $this->email_label . ':</dt><dd>' . $email . '</dd>';
		}

		$phone = get_post_meta( $order->get_id(), $this->phone_meta, true );
		
		if( $phone ){
			echo '<dt>' . $this->phone_label . ':</dt><dd>' . $phone . '</dd>';
		}

	}

	/**
     * Display meta in my-account area Order overview
     *
     * @var  array $fields
     * @return  array
     * @since 1.0
     */

	public function email_after_customer_details( $order, $sent_to_admin = false, $plain_text = false ){
		$email = get_post_meta( $order->get_id(), $this->email_meta, true );
		$phone = get_post_meta( $order->get_id(), $this->phone_meta, true );

		if ( $plain_text ) {
			if( $email ){
				echo $this->email_label . ': ' . $email . "\n";
			}
			if( $phone ){
				echo $this->phone_label . ': ' . $phone . "\n";
			}
		} else {
			if( $email ){
				echo '<p><strong>' . $this->email_label . ':</strong> ' . $email . '</p>';
			}
			if( $phone ){
				echo '<p><strong>' . $this->phone_label . ':</strong> ' . $phone . '</p>';
			}
			
		}
	}

} //end class: do not remove or there will be no more guacamole for you

endif; // end class_exists check


/**
 * Returns the main instance of WC_Shipping_Contact to prevent the need to use globals.
 *
 * @since  1.0
 * @return WooCommerce
 */
function wc_shipping_contact() {
  return WC_Shipping_Contact::instance();
}

// Launch the whole plugin
add_action( 'woocommerce_loaded', 'wc_shipping_contact' );

moved here: https://github.com/helgatheviking/wc-shipping-contact