public function setSize($size = null) {
        $this->_size = is_int($size)? $size : self::DEFAULT_SIZE;
    }
public function setSize($size = null) {
        $this->_size = is_int($size)? $size : self::DEFAULT_SIZE;
    }
public function setSize ( $ size = null ) { $ this -> _size = is_int ( $ size ) ? $ size : self :: DEFAULT_SIZE ; }
Set buffer size

@param int $size
Set buffer size