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public function write_log($level, $msg)
	{
		if ($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;
		}
		$filepath = $this->_log_path.'log-'.date('Y-m-d').'.'.$this->_file_ext;
		$message = '';
		if ( ! file_exists($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;
		}
		flock($fp, LOCK_EX);
		// Instantiating DateTime with microseconds appended to initial date is needed for proper support of this format
		if (strpos($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 .= $this->_format_line($level, $date, $msg);
		for ($written = 0, $length = self::strlen($message); $written < $length; $written += $result)
		{
			if (($result = fwrite($fp, self::substr($message, $written))) === FALSE)
			{
				break;
			}
		}
		flock($fp, LOCK_UN);
		fclose($fp);
		if (isset($newfile) && $newfile === TRUE)
		{
			chmod($filepath, $this->_file_permissions);
		}
		return is_int($result);
	}