Cdb.php

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<?php
abstract class CdbReader {
    protected $handle;

    public static function open( $fileName ) {
        return self::haveExtension() ?
            new CdbReaderDBA( $fileName ) :
            new CdbReaderPHP( $fileName );
    }

    public static function haveExtension() {
        if ( !function_exists( 'dba_handlers' ) ) {
            return false;
        }
        $handlers = dba_handlers();
        if ( !in_array( 'cdb', $handlers ) || !in_array( 'cdb_make', $handlers ) ) {
            return false;
        }

        return true;
    }

    abstract public function __construct( $fileName );

    abstract public function close();

    abstract public function get( $key );
}

abstract class CdbWriter {
    protected $handle;

    protected $realFileName;

    protected $tmpFileName;

    public static function open( $fileName ) {
        return CdbReader::haveExtension() ?
            new CdbWriterDBA( $fileName ) :
            new CdbWriterPHP( $fileName );
    }

    abstract public function __construct( $fileName );

    abstract public function set( $key, $value );

    abstract public function close();

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

    protected function isWindows() {
        return substr( php_uname(), 0, 7 ) == 'Windows';
    }
}

class CdbException extends Exception {
}