dbm functionsPHP ManualPrevNextXI. dbm functions 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). Example 1. dbm example 1  2 $dbm = dbmopen("lastseen", "w"); 3 if (dbmexists($dbm, $userid)) { 4  $last_seen = dbmfetch($dbm, $userid); 5 } else { 6  dbminsert($dbm, $userid, time()); 7 } 8 do_stuff(); 9 dbmreplace($dbm, $userid, time()); 10 dbmclose($dbm); 11  Table of Contentsdbmopen — opens a dbm databasedbmclose — closes a dbm databasedbmexists — tells if a value exists for a key in a dbm databasedbmfetch — fetches a value for a key from a dbm databasedbminsert — inserts a value for a key in a dbm databasedbmreplace — replaces the value for a key in a dbm databasedbmdelete — deletes the value for a key from a dbm databasedbmfirstkey — retrieves the first key from a dbm databasedbmnextkey — retrieves the next key from a dbm databasedblist — describes the dbm-compatible library being usedPrevHomeNextdbase_numrecordsUpdbmopen