locking / unlocking

[apm]

There is no command in PHP to lock and unlock table. Hw is it acheived using PHP ( I know the syntaxt for the command line).

is it mysql_query("LOCK..."); or something else?

Are there another issues one should be aware of while locking tables apart from the fact that if you lock it unlock it too.

ALso which is the best type of lock that should be put on a table ?

I update , Insert and Select so was wondering what would be the best locks for each of[nbsp][nbsp]the functions.

THanks
APoorva