title: Cron job to execute a PHP program
body: <p>I have a Linux server and in this I want to execute a cron job for sending birthday mail to all my friend with a PHP program. I want to create a php program that read data from database and send the mail. </p>
  
  <p>I want to know the command of cron job to execute the program on every day automatically. I have no knowledge of Linux commands.</p>