PHP

Add a Related String Resource to an Email

Demonstrates the Chilkat Email.AddRelatedString method, which adds a text-based related MIME resource, such as a style sheet, from an in-memory string and returns the generated Content-ID. The first argument is the MIME resource name, the second is the text content, and the third is the charset used to encode it. Because the Content-ID is generated by the call, this example adds the style sheet first, then builds an HTML body in a StringBuilder that references the style sheet by that cid:, and passes the result to SetHtmlBody.

Background: Related items are not always images loaded from disk — sometimes the resource is text you already have in memory, like a generated CSS style sheet or an SVG. AddRelatedString lets you embed such content directly without writing a temporary file first. As with other related items, it lives in the multipart/related enclosure and is referenced from the HTML by the Content-ID the method returns.

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<?php

use Chilkat2\Email;
use Chilkat2\StringBuilder;

// Demonstrates the AddRelatedString method, which adds a text-based related MIME resource
// (such as a style sheet) from an in-memory string and returns the generated Content-ID.
// The first argument is the resource name, the second is the text content, the third is the charset.

$email = new Email();
$email->Subject = 'Email with a related style sheet';

// Add the text-based related resource first; capture the generated Content-ID.
try {
    $cid = $email->AddRelatedString('styles.css', 'body { color: navy; }', 'utf-8');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// Build the HTML body, referencing the related style sheet by its Content-ID.  A
// placeholder is used and then replaced with the actual Content-ID.
$sbHtml = new StringBuilder();
$sbHtml->Append('<html><head><link rel="stylesheet" href="cid:PLACEHOLDER_CID"/></head><body>Styled content.</body></html>');
$numReplaced = $sbHtml->Replace('PLACEHOLDER_CID', $cid);
$email->SetHtmlBody($sbHtml->GetAsString());

echo 'Related Content-ID = ', $cid, "\n";
echo 'NumRelatedItems = ', $email->NumRelatedItems, "\n";