Set Environment variables for Production and Staging server (NGINX, SHELL, CRON, CRONTAB, ENV, CAKEPHP)

crontab

########################################  SITUATION  #########################################
# Had to set environment variable somewhere in server block or crontab 
# so different databases are used by the cron function for staging and production environment
# and operations are performed based on environment
# Tried setting variable in /etc/php/7.0/fpm/pool.d/www.conf, but didnt worked for crons/shells
# Also tried setting variable in /etc/environment but no luck for above purpose
# I might have missed something in above 2 methods, but below one worked for me.
##############################################################################################

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

#... After crontab variables ...#
# Set environment variables for production
APP_ENV=production
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* *	* * * 	www-data cd /var/www/html/example.com/code/bin && ./cake app main >/dev/null 2>&1

# Overwrite the ENVIRONMENT variables for staging
APP_ENV=staging
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* *	* * * 	www-data cd /var/www/html/example.com/code/bin && ./cake app main >/dev/null 2>&1

# Done.