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<?php
/**
* Bitrix Framework
* @package bitrix
* @subpackage main
* @copyright 2001-2016 Bitrix
*/
namespace Bitrix\Main\Text;
class UtfSafeString
{
public static function getLastPosition($haystack, $needle)
{
if (defined("BX_UTF"))
{
//mb_strrpos does not work on invalid UTF-8 strings
$ln = strlen($needle);
for ($i = strlen($haystack) - $ln; $i >= 0; $i--)
{
if (substr($haystack, $i, $ln) == $needle)
{
return $i;
}
}
return false;
}
return strrpos($haystack, $needle);
}
public static function rtrimInvalidUtf($string)
{
//valid UTF-8 octet sequences
//0xxxxxxx
//110xxxxx 10xxxxxx
//1110xxxx 10xxxxxx 10xxxxxx
//11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
$last4bytes = \CUtil::binsubstr($string, -3);
$reversed = array_reverse(unpack("C*", $last4bytes));
if (($reversed[0] & 0x80) === 0x00) //ASCII
return $string;
elseif (($reversed[0] & 0xC0) === 0xC0) //Start of utf seq (cut it!)
return \CUtil::binsubstr($string, 0, -1);
elseif (($reversed[1] & 0xE0) === 0xE0) //Start of utf seq (longer than 2 bytes)
return \CUtil::binsubstr($string, 0, -2);
elseif (($reversed[2] & 0xE0) === 0xF0) //Start of utf seq (longer than 3 bytes)
return \CUtil::binsubstr($string, 0, -3);
return $string;
}
}