Run PHP Script as Daemon in Linux (ubuntu) with Upstart

How to set it up:

Create a config file for your phpdaemon at /etc/init/phpdaemon.conf

# Info
description "PHP Daemon"
author      "Benedict E. Pranata"

# Events
start on startup
stop on shutdown

# Automatically respawn
# respawn the job up to 10 times within a 5 second period.
respawn
respawn limit 10 5

# Check before running
# exit if php script already running
pre-start script
  if ps -ef | grep -v grep | grep phpdaemon; then
    stop; exit 0
  fi
end script

# Run the script!
# Note, in this example, if your PHP script returns
# the string "ERROR", the daemon will stop itself.
script
    [ $(exec /usr/bin/php -f /path/to/your/phpdaemon.php) = 'ERROR' ] && ( stop; exit 1; )
end script

Starting & stopping your daemon:

sudo service phpdaemon start
sudo service phpdaemon stop

Check if your daemon is running:

sudo service myphpworker status