What is PhpDig?
PhpDig is a PHP MySQL based
Web Spider & Search Engine.



dba_exists — Checks whether a key exists.


bool dba_exists(key, dba_handle);
string key: Key to check
resource dba_handle: Resource handle opened by dba_open() or dba_popen()


TRUE if the key exists; FALSE otherwise


dba_exists() checks for the existence of the key specified in the key argument. If the key exists, the function returns TRUE. FALSE is returned for all other cases.


PHP Version: 3.0.8+, 4.0b2+

See also

To insert a new key-value pair (without overwriting an existing key)



Example 212. Check whether a key exists in a db file

$key = 'bar';
dba_exists ($key, $dba_handle)
    or die ("Key <i>$key</i> could not be found.");

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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