Enable error reporting in php-fpm (copied from https://github.com/rlerdorf/php7dev/issues/48#issuecomment-174212265)

php-fpm-enable-error-reporting.md

I was able to activate it, if anyone needs, just follow these steps:

1: edit:

sudo vim /usr/local/etc/php-fpm.d/www.conf

2: add to the end of the file:

catch_workers_output = yes

php_flag[display_errors] = on
php_admin_value[error_log] = /var/log/fpm-php.www.log
php_admin_flag[log_errors] = on

3: create the log file, so php-fpm can write on it:

touch /var/log/fpm-php.www.log && chmod 666 /var/log/fpm-php.www.log

and then you can see all errors/warnings/etc using:

tail -f /var/log/fpm-php.www.log