add additional 'to' email' programmatically with PHP

I need to add additional email addresses depending on some form inputfields.
How can I do this with PHP?

Regrds,Bert

Hi bert,

Please see FAQ 31 from the FAQ menu above. Not quite what you want but very close. The 'To' emails are in a comma separated list so you'll need to add any extras to the end of the string.

Bob