dba_firstkey

(PHP 4, PHP 5, PHP 7)

dba_firstkey — Fetch first key

说明

dba_firstkey ( resource $handle ) : string

dba_firstkey() returns the first key of the database and resets the internal key pointer. This permits a linear search through the whole database.

参数

handle

The database handler, returned by dba_open() or dba_popen().

返回值

Returns the key on success 或者在失败时返回 FALSE.

参见