Elgg\PersistentLoginService::isLegacyToken PHP Method

Is the given token a legacy MD5 hash?

protected isLegacyToken ( string $token ) : boolean
$token	string	The token to analyze
return	boolean

    protected function isLegacyToken($token)
    {
        return isset($token[0]) && $token[0] !== 'z';
    }

PersistentLoginService