Integration CodeIgniter(+2.0) and log4php.
cp -R ci_app [CI Application Directory]
cp -R ci_log4php [CI Application Directory]/application/third_party/
do edit log_threshold
$config['log_threshold'] = 0;
do not use log_path
$config['log_path'] = '';
// CodeIgniter default logging function.
log_message('debug', 'hogehoge');
// Use ci-log4php sugar functions.
$this->load->helper('log4php');
log_error('hogehoge');
log_info('hogehoge');
log_debug('hogehoge');