PHP

Convert a MIME Entity to multipart/alternative

Demonstrates the Chilkat Mime.ConvertToMultipartAlt method, which wraps the current entity in a new outer multipart/alternative, making the original the first child. It takes no arguments.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: Use this to add an alternate rendering to an existing message — for example, promoting a plain-text message so an HTML version can be added alongside it. The original content becomes the first (least-preferred) alternative, and you append the richer representation after it. As with the mixed conversion, message-level headers move to the new outer entity.

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<?php

use Chilkat2\Mime;

$mime = new Mime();
try {
    $mime->LoadMimeFile('qa_data/message.eml');

    // Wrap the current entity in a new outer multipart/alternative entity.  The original entity
    // becomes the first child, ready for an alternate representation to be added.
    $mime->ConvertToMultipartAlt();

    // Add an alternative representation of the same content.
    $htmlPart = new Mime();
    $htmlPart->SetBodyFromHtml('<html><body>HTML alternative.</body></html>');

    $mime->AppendPart($htmlPart);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo 'Number of parts: ', $mime->NumParts, "\n";