Write to daily log in Wordpress

gistfile1.txt

if(!function_exists('write_log')){
    function write_log($log){
        //if(true === WP_DEBUG){
            $log_file_name = WP_CONTENT_DIR.'/logs/'.date('Y-m-d').'.log';
            if(is_writable($log_file_name)){
                if(is_array($log) || is_object($log)){
                    error_log(print_r($log, true)."\n", 3, $log_file_name);
                } else {
                    error_log($log."\n", 3, $log_file_name);
                }
            }
        //}
    }
}