login_as.php

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<?php
use Elgg\Exceptions\LoginException;

$user_guid = (int) get_input('user_guid');

$user = get_user($user_guid);
if (empty($user)) {
    return elgg_error_response(elgg_echo('action:user:login_as:unknown'));
}

$original_user = elgg_get_logged_in_user_entity();
$original_user_guid = $original_user->guid;

// store the original persistent login state to restore on logout_as.
$persistent = false;
if (isset($_COOKIE['elggperm'])) {
    if (($original_perm_user = elgg_get_user_by_persistent_token($_COOKIE['elggperm'])) && $original_user->guid == $original_perm_user->guid) {
        $persistent = true;
    }
}

$session = elgg_get_session();
$session->set('login_as_original_user_guid', $original_user_guid);
$session->set('login_as_original_persistent', $persistent);

try {
    elgg_login($user);
    
    return elgg_ok_response('', elgg_echo('action:user:login_as:success', [$user->getDisplayName()]));
} catch (LoginException $exc) {
    $session->remove('login_as_original_user_guid');
    $session->remove('login_as_original_persistent');
    
    try {
        elgg_login($original_user);
    } catch (LoginException $ex) {
        // we can't log back in as ourselves? just leave us logged out then...
    }
    
    return elgg_error_response(elgg_echo('action:user:login_as:error', [$user->getDisplayName()]));
}