10.5.9 Windows: I have installed PHP, but when I to access a PHP script file via my browser, I get the error:

This error message means that PHP failed to output anything at all. To get to see a sensible error message, from the command line, change to the directory containing the PHP executable ( php.exe on Windows) and run php -i . If PHP has any problems running, then a suitable error message will be displayed which will give you a clue as to what needs to be done next. If you get a screen full of html codes (the output of the phpinfo function) then PHP is working.

Once PHP is working at the command line, try accessing the script via the browser again. If it still fails then it could be one of the following:

• File permissions on your PHP script, php.exe , php4ts.dll , php.ini or any PHP extensions you are trying to load are such that the anonymous internet user ISUR_<machinename> cannot access them.
• The script file does not exist (or possibly isn't where you think it is relative to your web root directory). Note that for IIS you can trap this error by ticking the 'check file exists' box when setting up the script mappings in the Internet Services Manager. If a script file does not exist then the server will return a 404 error instead. There is also the additional benefit that IIS will do any authentication required for you based on the NTLanMan permissions on your script file.