The DR-Congo left back has been a revelation for the Hammers this season and his continued presence in the squad will allow Zola to build a solid defensive line for the next season.
It's a very a good thing for us," Zola told the official site.
"Herita has been incredible for us all season so for West Ham it is a great thing that he is on a long contract. It is very good.
"He knew we have been talking about this for a long time but it's very good that he has committed to the club and he is a player that is going to give us a lot of satisfaction."
"He has never missed a game and his standard has been top. I don't remember one game where I wouldn't have given him a good rating. He has been incredible."