永远记得写日志，提高工作效率
private function logger($content)
{
$log = "log.txt";
$logsize = 100000;
if (file_exists($log) && filesize($log) > $logsize) {
unlink($log);
}
file_put_contents($log,date('H:i:s')." ".$content."\r\n",FILE_APPEND);
}
