(PHP 4, PHP 5, PHP 7, PHP 8)
dba_exists — Check whether key exists
$key
$dba
dba_exists() checks whether the specified key exists in the database.
key
The key the check is performed for.
dba
一个由 dba_open() 或 dba_popen() 返回的 Dba\Connection 实例。
Returns true if the key exists, false otherwise.
true
false