If your user doesn't have a php.ini file you may have to create one. This will go in the public_html folder for that user.
display_error = off
log_errors = On
error_log = "error.log"
or
Advance PHP Error handling via .htaccess
# supress php errors php_flag display_startup_errors off php_flag display_errors off php_flag html_errors off php_value docref_root 0 php_value docref_ext 0
# enable PHP error logging php_flag log_errors on php_value error_log /home/path/public_html/domain/PHP_errors.log
