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Textformatter: Relative Image Urls to HttpUrls

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I need to send E-Mails with embedded images. Therefore the image urls need to be absolute httpUrls instead of relative ones like /site/assets/...; I didn't find one, so I created this:

<?php namespace ProcessWire;

 * Converts relative CKEditor image urls to httpUrls
 * eg /site/assets/files/123/demo.png
 * to https://www.demo.com/site/assets/files/123/demo.png

class TextformatterImagesHttpUrl extends Textformatter {

  public static function getModuleInfo() {
    return array(
      'title' => 'Relative Image Urls to HttpUrls', 
      'version' => '1.0.0', 
      'summary' => "Converts relative CKEditor image urls to httpUrls.", 

  public function format(&$str) {
    $url = $this->wire->config->urls->files;
    $httpUrl = $this->wire->pages->get(1)->httpUrl;
    $httpUrl .= ltrim($url, "/");
    $url = str_replace("/", "\/", $url);
    $str = preg_replace("/src=\"$url/m", "src=\"$httpUrl", $str);
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