/phptmp taking up alot of diskspace

[zabersoft]

Hi

I'm running ispcp on a server with 6 websites - One of these is quite popular and I have noticed that the phptmp directory for this site is growing really fat (/var/www/virtual/domain.tld/phptmp ) - It's now at 2.7 Gigabytes and growing. Which has me a bit worried.

Why is it so big? Are these temp files not cleaned out periodically - or what is going on here?

Thank you for any input you might have