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



dbmopen — Opens a DBM file.


int dbmopen(filename, mode);
string filename: File to open
string mode: File mode


DBM identifier or FALSE on error


Creates a DBM file with the specified filename. Depending on the implementation of DBM, the file may or may not have an extension, and multiple files may be created. The filename parameter is essentially a basename and the file creation is handled by the DBM library. Additionally, an .lck file is created by PHP for file locking. dbmopen() returns an identifier that can be passed to other DBM functions.

The following table describes the modes.

r Read-only.
n New. May truncate an existing file if a file created by the same DBM implementation exists. Allows read-write operations.
c Create. Will not truncate an existing file, and allows read-write operations.
w Read-write. Will create the file if possible if it does not exist.


Existing since version 3.0


Example 240. Open a DBM file

if (!$dbm = dbmopen("testdb", "n")) {
    echo "Could not create DBM file!\n";

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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