error.php

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<?php
$type = elgg_extract('type', $vars);
$exception = elgg_extract('exception', $vars);

$params = elgg_extract('params', $vars, []);
$params['exception'] = elgg_extract('exception', $params, $exception);

$title = elgg_echo('error:default:title');
if (elgg_language_key_exists("error:{$type}:title")) {
    // use custom error title is available
    $title = elgg_echo("error:{$type}:title");
}

if (elgg_view_exists("errors/{$type}")) {
    $content = elgg_view("errors/{$type}", $params);
} else {
    $content = elgg_view('errors/default', $params);
}

$httpCodes = [
    '400' => 'Bad Request',
    '401' => 'Unauthorized',
    '403' => 'Forbidden',
    '404' => 'Not Found',
    '407' => 'Proxy Authentication Required',
    '500' => 'Internal Server Error',
    '503' => 'Service Unavailable',
];

if (isset($httpCodes[$type])) {
    elgg_set_http_header("HTTP/1.1 {$type} {$httpCodes[$type]}");
}

$layout = elgg_in_context('admin') && elgg_is_admin_logged_in() ? 'admin' : 'error';

$body = elgg_view_layout($layout, [
    'title' => $title,
    'content' => $content,
    'filter' => false,
]);

$shell = $layout;
if (!elgg_is_logged_in() && elgg_get_config('walled_garden')) {
    $shell = 'walled_garden';
}

echo elgg_view_page($title, $body, $shell);