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.


本扩展模块在 php.ini 中未定义任何配置选项。


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




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 — 说明
  • dbmopen — Opens a DBM database
  • dbmreplace — Replaces the value for a key in a DBM database

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