PHP5中文手册·Check whether key exists -- 追寻梦想＞编程乐园＞PHP 编程

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	PHP5中文手册 dba_delete dba_fetch dba PHP Manual dba_exists (PHP 4, PHP 5) dba_exists — Check whether key exists 说明 bool dba_exists ( string `$key` , resource `$handle` ) dba_exists() checks whether the specified `key` exists in the database. 参数 `key` The key the check is performed for. `handle` The database handler, returned by dba_open() or dba_popen(). 返回值 Returns `TRUE` if the key exists, `FALSE` otherwise. 参见 dba_delete() dba_fetch() dba_insert() dba_replace() dba_delete dba_fetch dba PHP Manual