Let me preface the following by saying that I have more experience with Apache/PHP on Linux than I do with the Nekoware packages for IRIX. I'm not an expert here.
The default php.ini should suffice for testing, so I don't think you need to worry about those settings until after you get the Apache configuration to run PHP. There are several parts to that. The following should work with the Apache2 and PHP5 packages from Nekoware /beta. If you're using the older stuff from /current the syntax will be different. (But I'd encourage you to use the /beta packages since they're much newer and need to be tested by somebody.)
First off you need to tell Apache to load the PHP module:
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LoadModule php5_module /usr/nekoware/apache2/modules/libphp5.so
Then enable the PHP processor on files with names ending in .php:
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<FilesMatch ".+\.php$">
SetHandler application/x-httpd-php
</FilesMatch>
And tell Apache that index.php can be used as well as index.html:
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DirectoryIndex index.html index.php
Restart Apache, and you should be good to go. If not, report back here with any messages from the Apache error logs and/or the web browser.
I haven't tested this on IRIX yet, so I'm kind of extrapolating from what's working on Linux boxes. In particular, be sure to double check the location of libphp5.so in the first configuration step! Also note that the above is a minimalist configuration for testing, just to get up and running. There are some other changes I might recommend later.
Once PHP is running, I'm sure we'll get HTTPS going, too.