plaintext.php

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<?php
use Elgg\Notifications\Notification;

$notifications = (array) elgg_extract('notifications', $vars);
$recipient = elgg_extract('recipient', $vars);
if (empty($notifications) || !$recipient instanceof \ElggEntity) {
    return;
}

// notification listing
// sort by content type
$sorted = [];

/* @var $notification Notification */
foreach ($notifications as $index => $notification) {
    /* @var $event \Elgg\Notifications\NotificationEvent */
    $event = elgg_extract('event', $notification->params);
    
    $category = 'other';
    
    $object = $event->getObject();
    if (empty($object)) {
        continue;
    }
    
    $entity = false;
    if ($object instanceof \ElggEntity) {
        $entity = $object;
    } elseif ($object instanceof \ElggAnnotation) {
        $entity = $object->getEntity();
    }
    
    if ($entity instanceof \ElggEntity && $recipient instanceof \ElggUser && !$entity->hasAccess($recipient->guid)) {
        // user no longer has access to entity
        continue;
    }
    
    if ($entity instanceof \ElggEntity) {
        if (elgg_language_key_exists("collection:{$entity->type}:{$entity->subtype}")) {
            $category = "collection:{$entity->type}:{$entity->subtype}";
        } elseif (elgg_language_key_exists("item:{$entity->type}:{$entity->subtype}")) {
            $category = "item:{$entity->type}:{$entity->subtype}";
        }
    }
    
    if (!array_key_exists($category, $sorted)) {
        $sorted[$category] = [];
    }
    
    $sorted[$category][$object->getTimeCreated() . '_' . $index] = $notification;
}

if (empty($sorted)) {
    // can happen if all notification objects have been removed
    return;
}

$unknowns = elgg_extract('other', $sorted, []);
unset($sorted['other']);

// sort based on the actual elgg_echo of the category not the language key
uksort($sorted, function($a, $b) {
    return strnatcasecmp(elgg_echo($a), elgg_echo($b));
});

if (!empty($unknowns)) {
    // add the rest to the end of the list
    $sorted['other'] = $unknowns;
}

$output = elgg_echo('notifications:delayed_email:body:intro') . PHP_EOL . PHP_EOL;

foreach ($sorted as $category => $sorted_notifications) {
    uksort($sorted_notifications, 'strnatcasecmp');
    
    $output .= elgg_echo($category, [], (string) $recipient->language) . PHP_EOL;
    
    /* @var $notification Notification */
    foreach ($sorted_notifications as $notification) {
        /* @var $event \Elgg\Notifications\NotificationEvent */
        $event = elgg_extract('event', $notification->params);
        
        $output .= ' - ';
        $output .= $notification->summary ?: $notification->subject;
        
        $object = $event->getObject();
        $entity = false;
        if ($object instanceof \ElggEntity) {
            $entity = $object;
        } elseif ($object instanceof \ElggAnnotation) {
            $entity = $object->getEntity();
        }
        
        if ($entity instanceof \ElggEntity) {
            $output .= ' ' . $object->getURL();
        }
        
        $output .= PHP_EOL;
    }
    
    $output .= PHP_EOL . PHP_EOL;
}

if (empty($output)) {
    return;
}

// add salutation and sign-off
echo elgg_view('notifications/body', [
    'body' => $output,
    'recipient' => $recipient,
]);