[Help ASAP PLEASE] form_multiselect insert...

[eluser]Ochetski[/eluser]
Your error is that "$actMat.'[]';" is not a valid value for a int (as defined on DB).
You should change the collumn type on DB to varchar or text.

@Roy's idea is also great. I use it my self and works great, you just have to make a function to create the array and another to convert it into a string when needed.