Hi,
To run a PHP script via a cron job (if you have the LWP Perl module installed):
1) Set up a shell script to run via cron, in the shell script put,
perl /pathtosite/run.pl
2) In the run.pl perl script put,
#!/bin/perl
use LWP::Simple;
$p = get "http://sitename/run.php";
print $p;
Note that the "print" is optional.
-- Santosh