Inserts a value for a key in a DBM database (PHP 3, PHP 4, PECL)
int dbminsert ( resource dbm_identifier, string key, string value )

Adds the value to the database with the specified key.

Returns -1 if the database was opened read-only, 0 if the insert was successful, and 1 if the specified key already exists. (To replace the value, use dbmreplace().)