OK, if you're root on a redhat box, you can just create a script and drop it into /etc/cron.hourly. They run in alphabetical order, by the way, so if you want it to run last just make it zzz_myscript and first, just make it aaa_myscript.
Now, you should have a program called wget installed, use it and you can even save the output. It's great for this kind of thing. the other option is to install the cgi-bin version of PHP and then copy the script from the web server to the /etc/cron.daily directory, and make the first like look like:
#!/usr/local/bin/php -q # or wherever your php bin is
<?php...