重写规则怎么改都失败

RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
#RewriteRule ^(.*)$ index.php [L,E=PATH_INFO:$1]
RewriteRule ^(.*)$ index.php/$1 [QSA,PT,L]


这样的话 No input file specified.


改RewriteRule ^(.*)$ index.php?/$1 [QSA,PT,L] 内页一直是首页
比如打开连接www.baidu.com/reg.php应该是www.baidu.com/index.php/reg.php
结果是首页,要怎么破