php session 判断:php 5.4中新增加对session状态判断的功能
在以前的php 版本中,要判断session是否有效,只能用如下的方法:
session_start();
if(isset($_session))
{
echo "started";
}
else
{
echo "not started";
}
而在php 5.4(即将发行)中,对session的状态进行了细分,可以用如下的方法判断:
session_start();
$status = session_status();
if($status == php_session_disabled)
{
echo "session is disabled";
}
else if($status == php_session_none )
{
echo "session enabled but no session values created";
}
else
{
echo "session enabled and session values created";
}
可以看到,通过使用session_status()返回的是一个int类型的值,表示出session的各种状态,比如禁止(php_session_disabled ),session还不存在
(php_session_none)
,或者session已经被建立起来了(php_session_active) 本文链接http://www.cxybl.com/html/wlbc/Php/20120607/28693.html

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