CdbDBA.php

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<?php
class CdbReaderDBA extends CdbReader {
    public function __construct( $fileName ) {
        $this->handle = dba_open( $fileName, 'r-', 'cdb' );
        if ( !$this->handle ) {
            throw new CdbException( 'Unable to open CDB file "' . $fileName . '"' );
        }
    }

    public function close() {
        if ( isset( $this->handle ) ) {
            dba_close( $this->handle );
        }
        unset( $this->handle );
    }

    public function get( $key ) {
        return dba_fetch( $key, $this->handle );
    }
}

class CdbWriterDBA extends CdbWriter {
    public function __construct( $fileName ) {
        $this->realFileName = $fileName;
        $this->tmpFileName = $fileName . '.tmp.' . mt_rand( 0, 0x7fffffff );
        $this->handle = dba_open( $this->tmpFileName, 'n', 'cdb_make' );
        if ( !$this->handle ) {
            throw new CdbException( 'Unable to open CDB file for write "' . $fileName . '"' );
        }
    }

    public function set( $key, $value ) {
        return dba_insert( $key, $value, $this->handle );
    }

    public function close() {
        if ( isset( $this->handle ) ) {
            dba_close( $this->handle );
        }
        if ( $this->isWindows() ) {
            unlink( $this->realFileName );
        }
        if ( !rename( $this->tmpFileName, $this->realFileName ) ) {
            throw new CdbException( 'Unable to move the new CDB file into place.' );
        }
        unset( $this->handle );
    }
}