where is the function _exception_handler writing to?

I see:

PHP Code:

        $_error =& load_class('Exceptions', 'core');
        $_error->log_exception('error', 'Exception: '.$exception->getMessage(), $exception->getFile(), $exception->getLine()); 


I just don't know where that would be writing to on my ubuntu server?

proof that an old dog can learn new tricks

CodeIgniter puts these in the path you provide in config.php Specifically, at $config ['log_path']. By default that is application/logs/

|--------------------------------------------------------------------------
| Error Logging Directory Path
|--------------------------------------------------------------------------
|
| Leave this BLANK unless you would like to set something other than the default
| application/logs/ directory. Use a full server path with trailing slash.
|
*/
$config['log_path'] = '';

So mine is blank. But when I look in /application/logs/ I see a bunch of log files. The last one was written 2018-10-29. Can I hard code the path to be APPPATH.'logs/' ?

proof that an old dog can learn new tricks

/application/logs/ is the default path and APPPATH.'logs/' evaluates to that same path. But, yes, you can hardcode that if you want.