Re : Help my tiki-install.php
I just check the code between 1.8 and 1.9 around SCRIPT_FILENAME
in 1.9:
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if (strpos($_SERVER["SERVER_SOFTWARE"],"IIS")==TRUE){ $docroot = dirname($_SERVER['PATH_TRANSLATED']); } else{ $docroot = getcwd(); }
in 1.8
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$docroot = dirname($_SERVER['SCRIPT_FILENAME']);
It seems something was fixed for IIS, perhaps you can try to change the code