- 'default' or -1: uses defaults from php.ini for error reporting level and display_errors
- 'none' or 0: disables error reporting entirely (in error log and in web browser)
- 'simple': enables display_errors, displays only E_ERROR, E_WARNING and E_PARSE
- 'maximum': enables display_errors, displays messages from E_ALL category
- 'development': enables display_errors, displays all error messages (-1, since php 5.4 this is the same as 'maximum')
- Numeric value: enables display_errors, value is passed raw to error_reporting() so it expects the same format
configure in configuration.php
public $error_reporting = 'default';