If you want to run a PHP script in the background forever through SSH then follow these steps:
If you are using a SSH terminal (PuTTY) then directly run following command:
// Notice '&'; that operator will help to run this script forever. php server.php & // make sure that you are in the root directory of server.php
Now your script is running in background and will keep running indefinitely even after closing terminal.
To check if your script is running or not You can run following command:
ps aux | grep server.php
If you want to do same thing through PHP instead of terminal then follow this tutorial:
PHP: How to run / execute a script in the background forever through SSH ?