PHP

Convert Inline Data-URL Images to Related Parts

Demonstrates the Chilkat Email.ConvertInlineImages method, which converts images embedded inline within HTML (as base64 data URLs) into multipart/related MIME parts referenced from the HTML by cid:. This example sets an HTML body containing a data-URL image and converts it.

Background: HTML can embed an image two ways: as a data: URL (the base64 bytes sit right in the src attribute) or as a related part referenced by cid:. Many email clients don't render data: URLs for security reasons, so converting them to proper multipart/related parts — the traditional email way to embed images — greatly improves how reliably the images display.

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<?php

use Chilkat2\Email;

// Demonstrates the ConvertInlineImages method, which converts images embedded inline within
// HTML (as base64 data URLs) into multipart/related MIME parts referenced from the HTML by
// CID.

$email = new Email();
$email->Subject = 'Convert inline images';

// An HTML body with a base64 data-URL image (a 1x1 PNG).
$email->SetHtmlBody('<html><body><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg=="/></body></html>');

echo 'NumRelatedItems before = ', $email->NumRelatedItems, "\n";

// Convert the inline data-URL image(s) to multipart/related parts referenced by CID.

try {
    $email->ConvertInlineImages();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo 'NumRelatedItems after = ', $email->NumRelatedItems, "\n";