I would recommend the cronjob too but if you want to just keep the script running, do a while-loop around your code, i.e.
while(1) { ... your code
sleep(120); // sleep 120 seconds }
--- the require should be outside of the loop IMHO ;).
Or if you want to run the script from the browser, use meta-refresh, see "Refresh Page" thread on this list.
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