CI框架中 日志输出方法log_message()只允许输出字符串解决方案

1.修改CodeIgniter/index.php，添加如下：

define('ROOTDIR',dirname(__FILE__).'/');



2.修改CodeIgniter/application/config/config.php,如下：

$config['log_threshold'] = 1;

$config['log_path'] = ROOTDIR.'logs/';



3.修改CodeIgniter/system/core/Common.php，如下：

a.找到log_message()方法，将行

$_log->write_log($level, $message, $php_error);

替换为

$_log->appendLog($level, $message, $php_error);

b.添加如下方法(该方法根据实际需求情况决定是否需要，此处非必要)

    function write_message($message, $fileName = '')

    {

            static $_log;



            $_log =& load_class('Log');

            $_log->writeLog($message, $fileName);



    }

    

4.修改CodeIgniter/system/libraries/Log.php

a.添加属性

protected $_log = '';

b.找到属性$_levels，将行

protected $_levels = array('ERROR' => '1', 'DEBUG' => '2',  'INFO' => '3', 'ALL' => '4');

替换为

// modified by xcg add -1

protected $_levels = array('ERROR' => '1', 'DEBUG' => '2',  'INFO' => '3', 'ALL' => '4', 'NORMAL' => '-1');

c.在构造方法 __construct()最后添加如下语句

// add by xcg

register_shutdown_function(array(& $this, '__writeLog'));

d.添加如下方法

// add by xcg for cache log

public function appendLog($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;

}



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



$this->_log .= $msg;

}

// add by xcg for writing log when request terminated

function __writeLog()

        {

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



            if ( ! $fp = @fopen($filepath, FOPEN_WRITE_CREATE))

            {

                    return FALSE;

            }

            flock($fp, LOCK_EX);

            fwrite($fp, $this->_log);

            flock($fp, LOCK_UN);

            fclose($fp);



            @chmod($filepath, FILE_WRITE_MODE);

            return TRUE;



        }



        // add by xcg for writing log to a special file.

function writeLog($message, $fileName = '')

   {

       $filepath = !empty($fileName)?$this->_log_path.$fileName:$this->_log_path.'ci-'.date('Y-m-d').".log";



               if ( ! $fp = @fopen($filepath, FOPEN_WRITE_CREATE))

               {

                       return FALSE;

               }



               $message = date($this->_date_fmt). '  '.print_r($message, true)."\n";



               flock($fp, LOCK_EX);

               fwrite($fp, $message);

               flock($fp, LOCK_UN);

               fclose($fp);



               @chmod($filepath, FILE_WRITE_MODE);

               return TRUE;



   }



5.最后，在apache或nginx的web目录下的CodeIgniter项目根目录下新建一个权限为777的logs文件夹