session出错，高手请帮忙...急！！！

[heeh]

新装的linux8.0+apache2.0.45+php4.3.1
我的apache安装在/usr/local/www/apache下
php安装在/usr/local/www/php下...
程序原来是win2000下的没问题的,
<?
session_start();

$a=$_SESSION['a']; '出错..提示
'Notice: Undefined index: a in /usr/local/www/apache/htdocs/test.php on line 4
$b=$_SESSION['b']; '这里也一样
?>
是哪里配置出错了...高手请帮忙..
phpinfo显示
Session Support enabled
Registered save handlers files user

Directive Local Value Master Value
session.auto_start Off Off
session.bug_compat_42 On On
session.bug_compat_warn On On
session.cache_expire 180 180
session.cache_limiter nocache nocache
session.cookie_domain no value no value
session.cookie_lifetime 0 0
session.cookie_path / /
session.cookie_secure Off Off
session.entropy_file no value no value
session.entropy_length 0 0
session.gc_dividend 1000 1000
session.gc_maxlifetime 1440 1440
session.gc_probability 1 1
session.name PHPSESSID PHPSESSID
session.referer_check no value no value
session.save_handler files files
session.save_path /usr/local/tmp /usr/local/tmp
session.serialize_handler php php
session.use_cookies On On
session.use_only_cookies Off Off
session.use_trans_sid Off Off

[bombshell]

感到奇怪！

[suolan]

register_globals=On

如果还不行，那就
error_reporting = E_ALL & ~E_NOTICE

或者你的那个“a”和“b”从哪里来的？好象需要声明的。

//刚学php,参与中

[heeh]

已经解决，谢谢各位