Lighttpd bash script to toggle between HHVM and php in a Ubuntu system.

toggle-hhvm

#!/bin/bash
#
# Lighttpd bash script to toggle between HHVM and PHP.
#
# Place the file in a shared bin directory so the file can be executed as root 
# ex. /usr/local/bin/toggle-hhvm
#
if [ "$(id -u)" != "0" ]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

if [ -f /etc/lighttpd/conf-enabled/15-fastcgi-php.conf ]; then
    lighty-disable-mod fastcgi-php
    lighty-enable-mod fastcgi-hhvm
    echo "########################"
    echo "###### Using HHVM ######"
    echo "########################"
else
    lighty-disable-mod fastcgi-hhvm
    lighty-enable-mod fastcgi-php
    echo "########################"
    echo "###### Using PHP #######"
    echo "########################"
fi

service lighttpd restart