Função PHP para criar GUID
function create_guid() { // Create GUID (Globally Unique Identifier)
$guid = '';
$namespace = rand(11111, 99999);
$uid = uniqid('', true);
$data = $namespace;
$data .= $_SERVER['REQUEST_TIME'];
$data .= $_SERVER['HTTP_USER_AGENT'];
$data .= $_SERVER['REMOTE_ADDR'];
$data .= $_SERVER['REMOTE_PORT'];
$hash = strtoupper(hash('ripemd128', $uid . $guid . md5($data)));
$guid = substr($hash, 0, 8) . '-' .
substr($hash, 8, 4) . '-' .
substr($hash, 12, 4) . '-' .
substr($hash, 16, 4) . '-' .
substr($hash, 20, 12);
return $guid;
}
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