Horde_Mime_Part::offsetUnset PHP Method

    public function offsetUnset($offset)
    {
        if ($part = $this[$offset]) {
            if ($part->parent === $this) {
                if (($k = array_search($part, $this->_parts, true)) !== false) {
                    unset($this->_parts[$k]);
                    $this->_parts = array_values($this->_parts);
                }
            } else {
                unset($part->parent[$offset]);
            }
            $this->_status |= self::STATUS_REINDEX;
        }
    }