Which version of CodeIgniter am I currently using?
Yes, the constant CI_VERSION will give you the current CodeIgniter version number. It's defined in: /system/codeigniter/CodeIgniter.php As of CodeIgniter 2, it's defined in /system/core/CodeIgniter.php
For example,
echo CI_VERSION; // echoes something like 1.7.1
You should try :
<?phpecho CI_VERSION;?>Or check the file system/core/CodeIgniter.php