class-wc-custom-email.php

/**
 * @extends \WC_Email
 */
class WC_Custom_Order_Email extends WC_Email {

	/**
	 * Set email defaults
	 */
	public function __construct() {

		// set ID, this simply needs to be a unique name
		$this->id = 'wc_custom_email';

		// title for this email's setting panel in WooCommerce Email settings
		$this->title = 'Custom Email';

		// email description in WooCommerce email settings
		$this->description = 'These order notification emails are sent when a customer places an order.';

		// default heading and subject lines (can be overridden using the settings panel)
		$this->heading = 'New Order';
		$this->subject = 'New Order';

		// define the locations of the templates that this email should use
		$this->template_html  = 'emails/admin-new-order.php';
		$this->template_plain = 'emails/plain/admin-new-order.php';

		// trigger this email when a new order is placed
		// if you want a different behaviour, look for different triggers.
		
		add_action( 'woocommerce_order_status_pending_to_processing_notification', array( $this, 'trigger' ) );
		add_action( 'woocommerce_order_status_pending_to_completed_notification', array( $this, 'trigger' ) );
		add_action( 'woocommerce_order_status_pending_to_on-hold_notification', array( $this, 'trigger' ) );
		add_action( 'woocommerce_order_status_failed_to_processing_notification', array( $this, 'trigger' ) );
		add_action( 'woocommerce_order_status_failed_to_completed_notification', array( $this, 'trigger' ) );
		add_action( 'woocommerce_order_status_failed_to_on-hold_notification', array( $this, 'trigger' ) );

		// Call parent constructor to load any other defaults not explicity defined here
		parent::__construct();

		// this sets the recipient to the settings defined below in init_form_fields()
		$this->recipient = $this->get_option( 'recipient' );

		// if none was entered, just use the WP admin email as a fallback
		if ( ! $this->recipient )
			$this->recipient = get_option( 'admin_email' );
	}


	/**
	 * Determine if the email should actually be sent and setup email merge variables
	 *
	 * @param int $order_id
	 */
	public function trigger( $order_id ) {

		// bail if no order ID is present
		if ( ! $order_id )
			return;

		// setup order object
		$this->object = new WC_Order( $order_id );

		if ( ! $this->is_enabled() || ! $this->get_recipient() )
			return;

		// woohoo, send the email!
		$this->customSend( $this->get_recipient(), $this->object->billing_first_name, $this->object->billing_email, $this->get_subject(), $this->get_content(), $this->get_headers(), $this->get_attachments() );
	}

/**
 *  Send the email via a custom sending function that grants more control over header values.
 *
 * @access public
 * @param mixed $to
 * @param mixed $subject
 * @param mixed $message
 * @param string $headers
 * @param string $attachments
 * @param string $content_type
 * @return void
 */
	public function customSend( $to, $from_name, $from_address, $subject, $message, $headers = "Content-Type: text/html\r\n", $attachments = "", $content_type = 'text/html' ) {

		// Set content type
		$this->_content_type = $content_type;

		// Filters for the email
		// Note custom method calls that grab customer billing name and email address
		add_filter( 'wp_mail_from', array( $this, 'custom_get_from_address' ) );
		add_filter( 'wp_mail_from_name', array( $this, 'custom_get_from_name' ) );
		add_filter( 'wp_mail_content_type', array( $this, 'get_content_type' ) );

		// Send
		wp_mail( $to, $subject, $message, $headers, $attachments );

		// Unhook filters
		remove_filter( 'wp_mail_from', array( $this, 'custom_get_from_address' ) );
		remove_filter( 'wp_mail_from_name', array( $this, 'custom_get_from_name' ) );
		remove_filter( 'wp_mail_content_type', array( $this, 'get_content_type' ) );
	}

/**
 *  Get customer billing email address
 *
 * @return string;
 */

	public function custom_get_from_address() {
		return $this->object->billing_email;
	}

/**
 *  Get customer name
 *
 * @return string;
 */

	public function custom_get_from_name() {
		return $this->object->billing_first_name;
	}


	/**
	 * get_content_html function.
	 *
	 * @return string
	 */
	public function get_content_html() {
		ob_start();
		woocommerce_get_template( $this->template_html, array(
			'order'         => $this->object,
			'email_heading' => $this->get_heading()
		) );
		return ob_get_clean();
	}


	/**
	 * get_content_plain function.
	 *
	 * @return string
	 */
	public function get_content_plain() {
		ob_start();
		woocommerce_get_template( $this->template_plain, array(
			'order'         => $this->object,
			'email_heading' => $this->get_heading()
		) );
		return ob_get_clean();
	}


	/**
	 * Initialize Settings Form Fields
	 *
	 */
	public function init_form_fields() {

		$this->form_fields = array(
			'enabled'    => array(
				'title'   => 'Enable/Disable',
				'type'    => 'checkbox',
				'label'   => 'Enable this email notification',
				'default' => 'yes'
			),
			'recipient'  => array(
				'title'       => 'Recipient(s)',
				'type'        => 'text',
				'description' => sprintf( 'Enter recipients (comma separated) for this email. Defaults to <code>%s</code>.', esc_attr( get_option( 'admin_email' ) ) ),
				'placeholder' => '',
				'default'     => ''
			),
			'subject'    => array(
				'title'       => 'Subject',
				'type'        => 'text',
				'description' => sprintf( 'This controls the email subject line. Leave blank to use the default subject: <code>%s</code>.', $this->subject ),
				'placeholder' => '',
				'default'     => ''
			),
			'heading'    => array(
				'title'       => 'Email Heading',
				'type'        => 'text',
				'description' => sprintf( __( 'This controls the main heading contained within the email notification. Leave blank to use the default heading: <code>%s</code>.' ), $this->heading ),
				'placeholder' => '',
				'default'     => ''
			),
			'email_type' => array(
				'title'       => 'Email type',
				'type'        => 'select',
				'description' => 'Choose which format of email to send.',
				'default'     => 'html',
				'class'       => 'email_type',
				'options'     => array(
					'plain'	    => __( 'Plain text', 'woocommerce' ),
					'html' 	    => __( 'HTML', 'woocommerce' ),
					'multipart' => __( 'Multipart', 'woocommerce' ),
				)
			)
		);
	}


} // end \WC_Expedited_Order_Email class

woocommerce-custom-email.php

/**
 *  Add a custom email to the list of emails WooCommerce should load
 *
 * @param array $email_classes available email classes
 * @return array filtered available email classes
 */

function add_custom_order_woocommerce_email( $email_classes ) {

	require( 'includes/class-wc-custom-email.php' );

	// add the email class to the list of email classes that WooCommerce loads
	$email_classes['WC_Custom_Order_Email'] = new WC_Custom_Order_Email();

	return $email_classes;

}

add_filter( 'woocommerce_email_classes', 'add_custom_order_woocommerce_email' );