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OR statements in metatags...
<?php
/**
* Implements hook_metatags_attachments_alter().
*
* This function allows you to define fallback tokens in case a field is empty.
*
* If all fallback values are empty, the tag will be empty.
*
* Example: [node:field_image:medium]||[node:field_legacy_image:medium]||/fallback.png
*/
function example_metatags_attachments_alter(array &$metatag_attachments) {
if (!empty($metatag_attachments['#attached']['html_head'])) {
$url = \Drupal::request()->getSchemeAndHttpHost();
$insecure_url = str_replace('https://', 'http://', $url);
foreach ($metatag_attachments['#attached']['html_head'] as &$attachment) {
if (isset($attachment[0]['#attributes']['content'])) {
$value = &$attachment[0]['#attributes']['content'];
}
elseif (isset($attachment[0]['#attributes']['href'])) {
$value = &$attachment[0]['#attributes']['href'];
}
if (isset($value) && strpos($value, '||') !== FALSE) {
$new_value = FALSE;
foreach (explode('||', $value) as $option) {
// We have to check against the URL because metatag will prepend our
// special tag value with the site URL if the tag plugin uses
// absolute URLs.
if (!empty($option) && $option !== $url && $option !== $insecure_url) {
// Make relative URLs absolute.
if (strpos($option, '/') === 0) {
$option = rtrim($url, '/') . $option;
}
$new_value = trim($option);
break;
}
}
$value = $new_value ?: '';
}
}
}
}
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