Nawet ci powiem gdzie to jest:
; Print out errors (as a part of the output). For production web sites,
; you're strongly encouraged to turn this feature off, and use error logging
; instead (see below). Keeping display_errors enabled on a production web site
; may reveal security information to end users, such as file paths on your Web
; server, your database schema or other information.
display_errors = on
; Even when display_errors is on, errors that occur during php's startup
; sequence are not displayed. It's strongly recommended to keep
; display_startup_errors off, except for when debugging.
display_startup_errors = on
; Log errors into a log file (server-specific log, stderr, or error_log (below))
; As stated above, you're strongly advised to use error logging in place of
; error displaying on production web sites.
log_errors = On
; If this parameter is set to Off, then memory leaks will not be shown (on
; stdout or in the log). This has only effect in a debug compile, and if
; error reporting includes E_WARNING in the allowed list
report_memleaks = On
; Store the last error/warning message in $php_errormsg (boolean).
track_errors = on
; Disable the inclusion of HTML tags in error messages.
;html_errors = Off
To tylko część.. przejrzyj te wszystkie opcje dokładnie

i dopasuj je do swoich potrzeb