save.php

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<?php
use Elgg\Exceptions\Http\EntityNotFoundException;
use Elgg\Exceptions\Http\EntityPermissionsException;

/* @var $request \Elgg\Request */

$guid = $request->getParam('guid');
if (isset($guid)) {
    $user = get_user($guid);
} else {
    $user = elgg_get_logged_in_user_entity();
}

if (!$user instanceof ElggUser) {
    throw new EntityNotFoundException();
}

if (!$user->canEdit()) {
    throw new EntityPermissionsException();
}

elgg_make_sticky_form('usersettings', ['password', 'password2']);

$event_params = [
    'user' => $user,
    'request' => $request,
];

// callbacks should return false to indicate that the sticky form should not be cleared
if (elgg_trigger_event_results('usersettings:save', 'user', $event_params, true)) {
    elgg_clear_sticky_form('usersettings');
}

foreach ($request->validation()->all() as $item) {
    if ($item->isValid()) {
        $message = $item->getMessage();
        if (!elgg_is_empty($message)) {
            elgg_register_success_message($message);
        }
    } else {
        $error = $item->getError();
        if (!elgg_is_empty($error)) {
            elgg_register_error_message($error);
        }
    }
}

return elgg_ok_response([
    'user' => $user,
    'validation' => $request->validation(),
]);