dbmfirstkey
(PHP 3, PHP 4, PECL)
dbmfirstkey -- Retrieves the first key from a DBM database
说明
string
dbmfirstkey ( resource dbm_identifier )
Returns the first key in the database. Note that no particular order
is guaranteed since the database may be built using a hash-table,
which doesn't guarantee any ordering.
参数
dbm_identifier
The DBM link identifier,
returned by dbmopen().
返回值
如果成功则返回 TRUE,失败则返回 FALSE。