system/libraries/Log.php

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<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * Logging Class
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Logging
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/general/errors.html
 */
class CI_Log {

	protected $_log_path;
	protected $_threshold	= 1;
	protected $_date_fmt	= 'Y-m-d H:i:s';
	protected $_enabled	= TRUE;
	protected $_levels	= array('ERROR' => '1', 'DEBUG' => '2',  'INFO' => '3', 'ALL' => '4');

	/**
	 * Constructor
	 */
	public function __construct()
	{
		$config =& get_config();

		$this->_log_path = ($config['log_path'] != '') ? $config['log_path'] : APPPATH.'logs/';

		if ( ! is_dir($this->_log_path) OR ! is_really_writable($this->_log_path))
		{
			$this->_enabled = FALSE;
		}

		if (is_numeric($config['log_threshold']))
		{
			$this->_threshold = $config['log_threshold'];
		}

		if ($config['log_date_format'] != '')
		{
			$this->_date_fmt = $config['log_date_format'];
		}
	}

	// --------------------------------------------------------------------