Send WooCommerce Order Emails Against an order id and email id

send-woocommerce-order-emails.php

<?php

/**
 * Send WooCommerce order email(s)
 *
 * @param integer $order_id WooCommerce order id.
 * @param string|array $email_id The id of the email or an array of the email ids that need to send.
 * @return bool Type returned Will return true if the email id provided is sent successfully.
 */
function send_wc_order_email($order_id, $email_id) {

  // Email ids of all the order emails (for reference purpose)
  $email_ids = array(
    'new_order',
    'cancelled_order',
    'failed_order',
    'customer_on_hold_order',
    'customer_processing_order',
    'customer_completed_order',
    'customer_refunded_order',
    'customer_invoice',
    'customer_note',
    'customer_reset_password',
    'customer_new_account',
  );

  $mailer = WC()->mailer();
  $emails = $mailer->get_emails();
  $email_sent = false;
  $emails_enabled = is_array($email_id) ? $email_id : array($email_id);

  if ( ! empty( $emails ) ) {

    foreach ( $emails as $email ) {

      if (in_array($email->id, $emails_enabled)) {

        $email->trigger($order_id);
        $email_sent = true;

      }

    }

  }

  return $email_sent;

}

In order to halt/block the default WooCommerce order emails use this: https://gist.github.com/mikejolley/3097073
Make sure you have enabled those emails you want to send in WooCommerce admin ( WC > Settings > Emails ) in order for the above function to work ( send_wc_order_email($order_id, $email_id) )

@ahmu83 where do i hook the function send_wc_order_email in order to get it work?