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# 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`。

## 参见

dbmnextkey()

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