php warning info

网站打开出现Warning: Cannot modify header information - headers already sent by (output started at...)

解决方法：
<?php

ob_start();

setCookie("name","lastVist",time()+3600);

if(!empty($_COOKIE['lastVisit']))

{

echo "last visit".$_COOKIE['lastVisit'];

setCookie("lastVisit",date("Y-m-d H:i:s"),time()+24*3600*30);

}

else

{

echo "Welcome";

setCookie("lastVisit",date("Y-m-d H:i:s"),time()+24*3600*30);

}

?>

在php文件开头加上ob_start();就可以搞定。