Note that the memory is lost after doing this. If you had a key 'foo' with a value of 1000 bytes, that 1000 bytes is lost, and the DB file size will reflect this.
(PHP 4, PHP 5, PHP 7)
dba_delete — Delete DBA entry specified by key
$key
, resource $handle
)dba_delete() deletes the specified entry from the database.
keyThe key of the entry which is deleted.
handleThe database handler, returned by dba_open() or dba_popen().
成功时返回 TRUE， 或者在失败时返回 FALSE。
Note that the memory is lost after doing this. If you had a key 'foo' with a value of 1000 bytes, that 1000 bytes is lost, and the DB file size will reflect this.