src/Zend/Filter/Compress/Bz2.php
public function setBlocksize($blocksize)
    {
        if (($blocksize < 0) || ($blocksize > 9)) {

            throw new Zend_Filter_Exception('Blocksize must be between 0 and 9');
        }

        $this->_options['blocksize'] = (int) $blocksize;
        return $this;
    }
public function setBlocksize($blocksize)
    {
        if (($blocksize < 0) || ($blocksize > 9)) {

            throw new Zend_Filter_Exception('Blocksize must be between 0 and 9');
        }

        $this->_options['blocksize'] = (int) $blocksize;
        return $this;
    }
Sets a new blocksize

@param integer $level
@return Zend_Filter_Compress_Bz2