Same has happened to me!
Although ive been trying to alter the install script to skip out the checking, unfortunately its something after the php version check and then after taking that out all the rest goes well, tries to load the form but is missing info about the database type - accidently took that out
Also after deleting just the php version I get
Warning: dl() has been disabled for security reasons in /home/jeffreyn/public_html/wiki/config/index.php on line 272
Yep, if unziped the original file and then just removed the error reporting line it now shows the php version and then the above error. Except, change the line to 278!
Now removed the dl() part of it when checking the database connection, it now shows
' * PHP 5.2.3 installed
Notice: Undefined variable: olderrornum in /home/jeffreyn/public_html/wiki/config/index.php on line 284
* Found database drivers for: MySQL
* PHP server API is cgi; using ugly URLs (index.php?title=Page_Title)
* Have XML / Latin1-UTF-8 conversion support.
* Session save path (/tmp) appears to be valid.
* PHP's memory_limit is 25M.
* Couldn't find Turck MMCache, eAccelerator, or APC. Object caching functions cannot be used.
* Found GNU diff3: /usr/bin/diff3.
* Found ImageMagick: /usr/bin/convert; image thumbnailing will be enabled if you enable uploads.
* Found GD graphics library built-in.
* Installation directory: /home/jeffreyn/public_html/wiki
* Script URI path: /wiki
* Environment checked. You can install MediaWiki.'