/***URL重定向*@paramstring$url重定向的URL地址*@paraminteger$time重定向的等待时间（秒）*@paramstring$msg重定向前的提示信息*@returnvoid*/$url='http://www.baidu.com';$time=3;functionredirect($url,$time=0,$msg=''){//多行URL地址支持$url=str_replace(array("\n","\r"),'',$url);//$url字符串中换行符\n回车符\r替换为空//给出提示信息if(empty($msg))$msg="系统将在{$time}秒之后自动跳转到{$url}！";//headers_sent—Checksiforwhereheadershavebeensentif(headers_sent()){//headers_sent未发送时为false//redirectif(0===$time){header('Location:'.$url);//Location定位}else{header("refresh:{$time};url={$url}");//refresh重新刷新echo($msg);}exit();}else{//headers_sent已发送情况html页面下定时刷新$str="<metahttp-equiv='Refresh'content='{$time};URL={$url}'>";if($time!=0)$str.=$msg;exit($str);}}