(PHP 4 >= 4.3.0, PHP 5, PHP 7)



array dba_handlers ([ bool $full_info = false ] )

dba_handlers() は、この拡張モジュールにより サポートされる全てのハンドラの一覧を返します。





データベースハンドラの配列を返します。full_infoTRUE の場合、この配列はハンドラ名をキー、そのバージョンを値とする 連想配列となります。それ以外の場合はハンドラ名を値に持つ数値添字の配列と なります。


cdb ライブラリが用いられている場合、 cdb および cdb_make が表示されます。

例1 dba_handlers() の例


echo "Available DBA handlers:\n";
foreach (
dba_handlers(true) as $handler_name => $handler_version) {
// バージョン番号を見やすくする
$handler_version str_replace('$'''$handler_version);
" - $handler_name$handler_version\n";


上の例の出力は、 たとえば以下のようになります。

Available DBA handlers:
 - cdb: 0.75, Revision: 
 - cdb_make: 0.75, Revision: 
 - db2: Sleepycat Software: Berkeley DB 2.7.7: (08/20/99)
 - inifile: 1.0, Revision: 
 - flatfile: 1.0, Revision: 

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User Contributed Notes 1 note

cbemerine at gmail dot com
8 years ago
A quick way to see which DBA handlers, without version numbers, that have been built into your version of MySQL on your system, use var_dump with dba_handler() as follows:

( "dba_handlers()" );

Many distros build in these DBA Handlers by default:
array(5) { [0]=>  string(3) "cdb" [1]=>  string(8) "cdb_make" [2]=>  string(3) "db4" [3]=>  string(7) "inifile" [4]=>  string(8) "flatfile" }

using print and pre tags for readability:

array(5) {


  string(3) "cdb"


  string(8) "cdb_make"


  string(3) "db4"


  string(7) "inifile"


  string(8) "flatfile"


Note there are issues with dba_insert and dba_replace without building for either GDBM or QDBM.
  Here are two sources for the list of DBA handlers: ( and; )

CDBM & CDB compiles have issues with updates, you can read databases and write new database files, but you will be prevented from using dba_replace() and you may have issues with dba_insert().

NDBM & DBM are depreciated.

DB2, DB3 & DB4 (Berkeley DB Sleepycat Software / Oracle)  Have read online about issues with dba_replace() and db4 specifically. Make sure you test your installation for correct usage of all DBA functions.

SDBM, TDB, TinyCDB were not listed on most of the sources I have found online.  Those DBA handlers and the names of the developers were listed on the QDBM source forge site.  How they interact with dba_replace() I do not know.  You should be aware of their existence. 

GDBM and QDBM are the only other two DBA handlers I am aware of.  Both are reported to allow PHP's dba_replace() function to work correctly so either may be an acceptable option.  The following three restrictions of traditional DBM are not issues for either GDBM or QDBM: 1) a process can handle only one database;  2) the size of a key and a value is bounded;   3) a database file is sparse.

DBA handler benchmark compares QDBM, GDBM, NDBM, SDBM, TDB, CDB, BDB, QDBM-BT-ASC, QDBM-BT-RND, BDB-BT-ASC, BDB-BT-RND can be found here: (;

QDBM seems to offer significant improvements in speed over the other DBA Handlers, test in your environment to verify the results.
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