useradd.php

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<?php
use Elgg\Exceptions\Configuration\RegistrationException;

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

// Get variables
$username = get_input('username');
$password = get_input('password', null, false);
$password2 = get_input('password2', null, false);
$email = get_input('email');
$name = get_input('name');

// This param is not included in the useradd form by default,
// but it allows sites to easily add the feature if necessary.
$language = get_input('language', elgg_get_config('language'));

$admin = get_input('admin');
$admin = is_array($admin) ? $admin[0] : $admin;

$autogen_password = get_input('autogen_password');
if ($autogen_password) {
    $password = elgg_generate_password();
    $password2 = $password;
}

// no blank fields
if ($username == '' || $password == '' || $password2 == '' || $email == '' || $name == '') {
    return elgg_error_response(elgg_echo('register:fields'));
}

if (strcmp($password, $password2) != 0) {
    return elgg_error_response(elgg_echo('RegistrationException:PasswordMismatch'));
}

// For now, just try and register the user
try {
    $new_user = elgg_register_user([
        'username' => $username,
        'password' => $password,
        'name' => $name,
        'email' => $email,
        'language' => $language,
    ]);
    
    if ($admin && elgg_is_admin_logged_in()) {
        $new_user->makeAdmin();
    }

    elgg_clear_sticky_form('useradd');

    $new_user->admin_created = true;
    $new_user->created_by_guid = elgg_get_logged_in_user_guid();

    $subject = elgg_echo('useradd:subject', [], $new_user->getLanguage());
    $body = elgg_echo('useradd:body', [
        elgg_get_site_entity()->getDisplayName(),
        elgg_get_site_entity()->getURL(),
        $username,
        $password,
    ], $new_user->getLanguage());

    notify_user($new_user->guid, elgg_get_site_entity()->guid, $subject, $body, [
        'action' => 'useradd',
        'object' => $new_user,
        'password' => $password,
        'apply_muting' => false,
    ]);

    return elgg_ok_response('', elgg_echo('adduser:ok', [elgg_get_site_entity()->getDisplayName()]));
} catch (RegistrationException $r) {
    return elgg_error_response($r->getMessage());
}