dbmfirstkey
(PHP 4)
dbmfirstkey — Retrieves the first key from a DBM database
說明
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.
Return值
如果成功則回傳 TRUE，失敗則回傳 FALSE。