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The MailAttachment class handles attachments in MailMessage instances. This class automatically encodes/decodes attachment content before/after sending/receiving messages. It also handles loading/saving attachments from/to files and keeps track of the mimetype of the attachment.

Creating a new attachment from an unencoded variable:

$attachment = new Attachment();
$attachment->body = $content;

Creating a new attachment from an base64 encoded variable as gotten from an email:

$attachment = new Attachment();
$attachment->decodeBody( $encoded_content );

Loading an attachment from file:

$attachment = new Attachment( "/path/to/file.here" );

Saving content of attachment to file using filename from attachment:

$attachment->saveFile();

Saving content of attachment to new filename:

$attachment->saveFile("/path/to/new.file" );