PHP

Get the Content-Location of a Related Item

Demonstrates the Chilkat Email.GetRelatedContentLocation method, which returns the Content-Location of a related item (typically an image or style sheet embedded within an HTML email). The index is zero-based. This example loads an image from a file into a BinData object and adds it as a related item addressed by Content-Location using AddRelatedBd2, then reads it back.

Background: Content-Location is the alternative to Content-ID for linking HTML to its embedded resources. Instead of a cid: reference, the HTML keeps an ordinary-looking src="logo.png", and the matching part carries a Content-Location of logo.png. Since the image is binary, it is loaded into a BinData object and added with AddRelatedBd2. This approach is common when an existing web page is turned into an email, since the original relative URLs can stay unchanged.

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<?php

use Chilkat2\BinData;
use Chilkat2\Email;

// Demonstrates the GetRelatedContentLocation method, which returns the Content-Location of
// a related item.  Related items are typically images and style sheets embedded within
// HTML emails.  The index is zero-based.

$email = new Email();
$email->Subject = 'GetRelatedContentLocation example';

// The HTML references the image by the same name used as the Content-Location.
$email->SetHtmlBody('<html><body><img src="logo.png"/></body></html>');

// Load the image data from a file into a BinData object.
$bdImage = new BinData();
try {
    $bdImage->LoadFile('qa_data/images/logo.png');

    // Add the image as a related item addressed by Content-Location "logo.png".
    $email->AddRelatedBd2($bdImage, 'logo.png');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// Read the Content-Location of the first related item (index 0).
$loc = $email->GetRelatedContentLocation(0);
echo 'Related item 0 Content-Location: ', $loc, "\n";

// Note: The path "qa_data/images/logo.png" is a relative local filesystem path,
// relative to the current working directory of the running application.