How to run a web page less then 1 minute with cron job?

Hello all,

I want to run a php page every 30 seconds with cron job, how can I do it?
The example below is find, or it make a problem with the memory if I run it every 1 minute with cronjob?
<?
sleep(30);
Command1;
?>

What is the purpose of this PHP page? If your using Linux (which I'm guessing you are since your running cron) wouldn't a simpy shell script work better?

Use atd rather than crontab. Crontab is designed for things 1minute plus. atd is deisgned for sub one minute jobs.

Also you can write a simple loop script in bash that can call on the php script for ever in the background.

If you are using Windows and want a more advanced scheduler with second precision and remote php-execution you should look at VisualCron -> http://www.visualcron.com

regards,

md