PHP Extension

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

include("chilkat.php");

//  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 CkEmail();
$email->put_Subject('Email with a related style sheet');

//  Add the text-based related resource first; capture the generated Content-ID.
$cid = $email->addRelatedString('styles.css','body { color: navy; }','utf-8');
if ($email->get_LastMethodSuccess() == false) {
    print $email->lastErrorText() . "\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 CkStringBuilder();
$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());

print 'Related Content-ID = ' . $cid . "\n";
print 'NumRelatedItems = ' . $email->get_NumRelatedItems() . "\n";

?>