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请解释一上session的几个小问题

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Jun 13, 2016 am 10:53 AM

commononceprintsession

请解释一下session的几个问题
require_once '/common.php';//公共文件，里边有对session的处理
print_r($_SESSION);//这里能正常打印出session
?>

然后把程序修改成如下，在原来没有关闭的浏览器上直接运行，就打印不出来SESSION了
print_r($_SESSION);//这里不能正常打印出session
require_once '/common.php';//公共文件，里边有对session的处理
?>
我个人理解是浏览器运行原来的页面后，服务器上已经存在了此次的SESSIONID，
然后修改程序后，浏览器再次利用COOKIE把SESSIONID发过去，服务器应该能够找到相应的SESSION，然后print_r($_SESSION)时应该能够打印出来SESSION，但是为什么修改后的程序打印不出来呢？

------解决方案--------------------
存是存在了，但你的session 还没start吧？？
common里应该有两步操作
1：session start
2：session set

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