CodeIgniter Error Log Info + Errors

You will not face the issue in codeigniter 2

$config['log_threshold'] = array(1, 3);

in config/config.php

and

log_message('info', 'The purpose of some variable is to provide some value.');

where you want to log something will only print that message to the log file, no excess debug code.

BUT

In codeIgniter 3, Many system core files have

log_message('info', ******************);

Like

log_message('info', 'Config Class Initialized');
log_message('info', 'Controller Class Initialized');
log_message('info', 'Hooks Class Initialized');
............

That's why when

$config['log_threshold'] = array(1, 3);

or

$config['log_threshold'] = array(3);

or

$config['log_threshold'] = 3;

then all the undesired log messages are appearing in log file.

So, the one way is to resolve this is to extend all core files and change

log_message('info'

to

log_message('debug' 

or creating a new thresold, like

in config/config.php

$config['log_threshold'] = array(1, 5);

in core/MY_Log.php

protected $_levels = array('ERROR' => '1', 'DEBUG' => '2', 'INFO' => '3', 'ALL' => '4', 'USER_INFO' => '5');

Full core/MY_Log.php file

class MY_Log extends 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', 'USER_INFO' => '5');

    /**
     * Constructor
     */
    public function __construct()
    {
        parent::__construct();

        $config =& get_config();

        $this->_log_path = ($config['log_path'] !== '') ? $config['log_path'] : APPPATH.'logs/';
        $this->_file_ext = (isset($config['log_file_extension']) && $config['log_file_extension'] !== '')
            ? ltrim($config['log_file_extension'], '.') : 'log';

        file_exists($this->_log_path) OR mkdir($this->_log_path, 0755, TRUE);

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

        if (is_numeric($config['log_threshold']))
        {
            $this->_threshold = (int) $config['log_threshold'];
        }
        elseif (is_array($config['log_threshold']))
        {
            $this->_threshold = 0;
            $this->_threshold_array = array_flip($config['log_threshold']);
        }

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

        if ( ! empty($config['log_file_permissions']) && is_int($config['log_file_permissions']))
        {
            $this->_file_permissions = $config['log_file_permissions'];
        }
    }

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

    /**
     * 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] > $this->_threshold))
            && ! isset($this->_threshold_array[$this->_levels[$level]]))
        {
            return FALSE;
        }

        if($level == 'USER_INFO')
        {
            $filepath = $this->_log_path . 'info-log-' . date('Y-m-d') . '.php';
        }
        else
        {
            $filepath = $this->_log_path . 'log-' . date('Y-m-d') . '.php';
        }

        $message = '';

        if ( ! file_exists($filepath))
        {
            $newfile = TRUE;
            // Only add protection to php files
            if ($this->_file_ext === 'php')
            {
                $message .= "<?php defined('BASEPATH') OR exit('No direct script access allowed'); ?>\n\n";
            }
        }

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

        // Instantiating DateTime with microseconds appended to initial date is needed for proper support of this format
        if (strpos($this->_date_fmt, 'u') !== FALSE)
        {
            $microtime_full = microtime(TRUE);
            $microtime_short = sprintf("%06d", ($microtime_full - floor($microtime_full)) * 1000000);
            $date = new DateTime(date('Y-m-d H:i:s.'.$microtime_short, $microtime_full));
            $date = $date->format($this->_date_fmt);
        }
        else
        {
            $date = date($this->_date_fmt);
        }

        $message .= $level.' - '.$date.' --> '.$msg."\n";

        flock($fp, LOCK_EX);

        for ($written = 0, $length = strlen($message); $written < $length; $written += $result)
        {
            if (($result = fwrite($fp, substr($message, $written))) === FALSE)
            {
                break;
            }
        }

        flock($fp, LOCK_UN);
        fclose($fp);

        if (isset($newfile) && $newfile === TRUE)
        {
            chmod($filepath, $this->_file_permissions);
        }

        return is_int($result);
    }

}

I realize this question is rather old, but I ran into the same problem myself and was able to modify the Log library to fix it.

modify the write_log function in Log.php as follows:

  public function write_log($level = 'error', $msg, $php_error = FALSE)
    {
        if ($this->_enabled === FALSE)
        {
            return FALSE;
        }

        $level = strtoupper($level);

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

You're then able to specify an array in your config file:

$config['log_threshold'] = array(3, 1);

And then your log file will look something like this:

ERROR - 2013-07-24 13:50:04 --> Severity: Warning  --> 
INFO  - 2013-07-24 13:50:04 --> The purpose of some variable is to provide some value.
ERROR - 2013-07-24 13:50:06 --> 404 Page Not Found --> 404.shtml

quickfix tested on codeigniter 2.1.4

copy

/system/libary/log.php

to

/application/libary/log.php

add following lines before $filepath (line 86)

// remove all DEBUG messages
if ( $this->_levels[$level] == 2 )
{
return FALSE;
}

a better way i will sugeest is to use the file sugested by codeigniter. I had the same problem and it foxed it. check it out here https://github.com/EllisLab/CodeIgniter/wiki/Custom-Logging-Threshold