title: sending emails automatically using php
body: <p>Sorry if this was too easy one.</p>
  
  <p>I am struck with a problem for 3 days.
  I need to send emails to the persons  whose licence is going to expire.
  The expiry dates will be in mysql database..
  I am searching for it since three days,but every answer described is to "start a task manager".
  But i don't understand how the task started in our system can be performed in server..?
  Is there a way to send emails automatically without manual interaction.
  I found lot on CRON JOB.But how can i install it in the server.</p>
  
  <p>Please help me if anyone has faced this earlier.
  Thanks in advance</p>