PHP debug logging file and browser

gistfile1.aw

<?
//logging file 
function debug_log($message = '<==========DEBUG LOG========>'){
   //directory log file 
   $dir = $_SERVER['DOCUMENT_ROOT'].'/logs';
   //save Output Buffer
   ob_start();
   print_r($message);
   $message = ob_get_clean();
   if(!file_exists($dir)){
      mkdir($dir);
   }

   //set time
   date_default_timezone_set('Asia/Seoul');
   $logData = '['.date('Y/m/d G:i:s').'] '.$message;
   error_log($logData.PHP_EOL,3,$dir.'/'.date('Ymd').'.log');
}

//logging browser 
function debug_log_view($message = '<==========DEBUG LOG========>'){
   echo('<div style="border:1px solid;"><pre>');
   ob_start();
   print_r($message);
   ob_end_flush();
   echo('</pre></div>');
}

?>