Руководство по PHP
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dba_exists

(PHP 3>= 3.0.8, PHP 4 )

dba_exists -- Check whether key exists

Description

bool dba_exists ( string key, resource handle)

dba_exists() checks whether the specified key exists in the database specified by handle.

Key is the key the check is performed for.

Handle is a database handle returned by dba_open().

dba_exists() returns TRUE or FALSE, if the key is found or not found, respectively.

See also: dba_fetch(), dba_delete(), dba_insert(), and dba_replace().

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dba_deleteУровень вышеdba_fetch