redirect php-fpm output to nginx's error log

php-fpm-nginx-errorlog.md

• php process is wrapped like this: PHP file -> php-fpm -> nginx
• basically means disable all facilities that catch output from the script on it's way to nginx
• standard error output will the end in Nginx's logging facility

On CentOS

• make sure your script does not set error_log
• edit /etc/php-fpm.conf, disable line error_log = /var/log/php-fpm/error.log
• edit /etc/php-fpm.d/www.conf, disable line starting with php_admin_value[error_log] = ...
• restart fpm: systemctl restart php-fpm
• tail /var/log/nginx/error.log to see if it worked

On Ubuntu

• pretty much the same, though php_admin_value[error_log] seems to be disabled by default

Notes

• long log lines getting truncated in Nginx: http://stackoverflow.com/questions/19084591/php-nginx-error-log-getting-truncated