source: sourcecode/system/libraries/Log.php @ 1

<?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'];
                }
        }

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

        /**
         * Write Log File
         *
         * Generally this function will be called using the global log_message() function
         *
         * @param       string  the error level
         * @param       string  the error message
         * @param       bool    whether the error is a native PHP error
         * @return      bool
         */
        public function write_log($level = 'error', $msg, $php_error = FALSE)
        {
                if ($this->_enabled === FALSE)
                {
                        return FALSE;
                }

                $level = strtoupper($level);

                if ( ! isset($this->_levels[$level]) OR ($this->_levels[$level] > $this->_threshold))
                {
                        return FALSE;
                }

                $filepath = $this->_log_path.'log-'.date('Y-m-d').'.php';
                $message  = '';

                if ( ! file_exists($filepath))
                {
                        $message .= "<"."?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed'); ?".">\n\n";
                }

                if ( ! $fp = @fopen($filepath, FOPEN_WRITE_CREATE))
                {
                        return FALSE;
                }

                $message .= $level.' '.(($level == 'INFO') ? ' -' : '-').' '.date($this->_date_fmt). ' --> '.$msg."\n";

                flock($fp, LOCK_EX);
                fwrite($fp, $message);
                flock($fp, LOCK_UN);
                fclose($fp);

                @chmod($filepath, FILE_WRITE_MODE);
                return TRUE;
        }

}
// END Log Class

/* End of file Log.php */
/* Location: ./system/libraries/Log.php */