$string = str_replace(array("\r\n","\n", "\r", " "),array('','','',''),$string);
$sStringRem = '';
$iMod = strlen($string) % 4;
if ($iMod) {
$sStringRem = substr($string,-$iMod);
$string = str_replace(array("\r\n","\n", "\r", " "),array('','','',''),$string);
$sStringRem = '';
$iMod = strlen($string) % 4;
if ($iMod) {
$sStringRem = substr($string,-$iMod);