Zend_Mime_Part is instantiated with a string that
represents the content of the new part. The type is assumed to be
OCTET-STREAM, encoding is 8Bit. After instantiating a
Zend_Mime_Part, meta information can be set by accessing its
attributes directly:
<?php
public $type = Zend_Mime::TYPE_OCTETSTREAM;
public $encoding = Zend_Mime::ENCODING_8BIT;
public $id;
public $disposition;
public $filename;
public $description;
public $charset;
public $boundary;
public $location;
public $language;