stored procedures in postgre || how to script and where

I understand that phpPgAdmin cannot call stored procedures on a schedule. I assume I can create a stored procedure in the same way as mySQL since, near as I can tell, the databases have pretty much identical functionality.

But how could I call a procedure every one minute or so. Is the windows task scheduler the best bet? Or should I write it in php and make it a cronjob?

Will SQLserver interfere with php (and vice versa) if they are both attempting to interact with the database at the same time? (connection loss/slowdown)

Thanks!