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DBM Functions [deprecated]


These functions allow you to store records stored in a dbm-style database. This type of database (supported by the Berkeley DB, » GDBM, and some system libraries, as well as a built-in flatfile library) stores key/value pairs (as opposed to the full-blown records supported by relational databases).

Note: DBM support is deprecated and you are encouraged to use the Database (dbm-style) abstraction layer functions instead.

Note: This extension has been removed from PHP and is no longer available as of PHP 5.0.0.


To use this functions you have to compile PHP with support for an underlying database. See the list of supported Databases.


In order to use these functions, you must compile PHP with dbm support by using the --with-db option. In addition you must ensure support for an underlying database or you can use some system libraries.

Konfiguration under drift

Den här utbyggnaden definerar inte några konfigurationsdirektiv i php.ini.


The function dbmopen() returns an database identifier which is used by the other dbm-functions.

Fördefinerade konstanter

Den här utbyggnaden har inte några konstanter definerade.


Example#1 DBM example


if (
dbmexists($dbm$userid)) {
$last_seen dbmfetch($dbm$userid);
} else {


Table of Contents

  • dblist — Describes the DBM-compatible library being used
  • dbmclose — Closes a dbm database
  • dbmdelete — Deletes the value for a key from a DBM database
  • dbmexists — Tells if a value exists for a key in a DBM database
  • dbmfetch — Fetches a value for a key from a DBM database
  • dbmfirstkey — Retrieves the first key from a DBM database
  • dbminsert — Inserts a value for a key in a DBM database
  • dbmnextkey — Description
  • dbmopen — Opens a DBM database
  • dbmreplace — Replaces the value for a key in a DBM database