PHP

Php-fpm

newrelic.appname = "web30 - liste.lillinet.org"
post_max_size = 52M
upload_max_filesize = 52M
memory_limit = 192M
catch_workers_output = yes
log_errors = On
display_errors = On
log_level = notice

Logs everything to file (htaccess format)

php_flag display_startup_errors on
php_flag display_errors off
php_flag html_errors off
php_flag log_errors on
#php_flag ignore_repeated_errors off
#php_flag ignore_repeated_source off
#php_flag report_memleaks on
#php_flag track_errors on
#php_value docref_root 0
#php_value docref_ext 0
php_value error_reporting -1
#php_value log_errors_max_len 0#
php_value error_log /var/local/www/web1/phperrors.log

This logs sintax erros too, not logged by default in apache error log or not logged if you're passing options inside the php file itself using ini_set.