title: How to schedule email notifications in php
body: <p>I know how to send email using PHPmail. But what if I need to send lots of emails?</p>
  
  <p>This could be a "notification" to site subscribers when a new message is posted. Doing that directly in page handler will seriously affect performance and make browser loading too slow. So I need to have this job done in the "background".</p>
  
  <p>How can I "schedule" something in PHP, in my case - sending emails? In C++ for example I would create a separate thread but AFAIK there is no such thing as multithreading in PHP.</p>