Defer Order Complete emails - Defer Order Complete emails for 10 minutes. DOES NOT WORK.

wc-defer-order-completed-emails.php

<?php
/*
Plugin Name: Defer Order Complete emails
Plugin URI: https://www.damiencarbery.com/
Description: Defer Order Complete emails for a few minutes.
Author: Damien Carbery
Author URI: https://www.damiencarbery.com
Version: 0.1
*/


add_filter( 'woocommerce_allow_send_queued_transactional_email', 'dcwd_whether_send_queued_wc_email', 10, 3 );
function dcwd_whether_send_queued_wc_email( $true, $filter, $args ) {
	error_log( 'woocommerce_allow_send_queued_transactional_email $filter: ' . var_export( $filter, true ) );
	error_log( 'woocommerce_allow_send_queued_transactional_email order_number: ' . var_export( $args[ 0 ], true ) );
	//error_log( 'woocommerce_allow_send_queued_transactional_email $args: ' . var_export( $args, true ) );
	
	if ( 'woocommerce_order_status_completed' == $filter ) {
		// TODO: Limit checks to this email.
	}
	$order = wc_get_order( $args[ 0 ] );
	$now = strtotime( current_time( 'mysql' ) );
	$order_modified = strtotime( $order->get_date_modified() );
	error_log( "woocommerce_allow_send_queued_transactional_email now/order modified: ".current_time( 'mysql' )."/".$order->get_date_modified() );
	
	if ( ( $now - $order_modified ) < 600 ) {
		error_log( 'woocommerce_allow_send_queued_transactional_email: Less than 600 sec so do not send email.' );
		return false;
	}
	//error_log( 'woocommerce_allow_send_queued_transactional_email modified: ' . var_export( $order->get_date_modified(), true ) );
	//error_log( 'woocommerce_allow_send_queued_transactional_email now: ' . var_export( time(), true ) );

	error_log( 'woocommerce_allow_send_queued_transactional_email: Ok to send email.' );
	return $true;
}