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Possible Duplicate:
using mysql_close()
Are mysql_close and pg_close required ?
In some script there aren’t… why ?
What happen if I don’t use its ?
If you don’t call it, the socket connection to the database remains open for ~30 seconds in a wait state.
If you get lots and lots of people and you don’t somehow manage to reuse these zombie connections, your database might explode with a too many users error.
So in answer to your question: syntactically not required but it’s very poor practice not to include them.