Understanding hook priorities

[ducohosting]

Hi everyone,

 

I'm working on a module that needs to execute three separate tasks after the daily cron job. They need to be executed in a specific order. However, I'm not sure what to watch out for when programming the hook priorities and haven't found any useful documentation on the matter.

 

My question is simple: Are functions with a lower hook priority executed before or after those of a higher priority? And, are duplicate priorities possible or will this result in an exception?

 

Thanks!