CXDImport::DetectUTF8

static function DetectUTF8($url)
{
	$arBytes = array();
	for($i=0, $n = mb_strlen($url); $i<$n; $i++)
		$arBytes[] = ord($url[$i]);

	$is_utf = 0;
	foreach($arBytes as $i => $byte)
	{
		if( ($byte & 0xC0) == 0x80 )
		{
			if( ($i > 0) && (($arBytes[$i-1] & 0xC0) == 0xC0) )
				$is_utf++;
			elseif( ($i > 0) && (($arBytes[$i-1] & 0x80) == 0x00) )
				$is_utf--;
		}
		elseif( ($i > 0) && (($arBytes[$i-1] & 0xC0) == 0xC0) )
			$is_utf--;
	}
	return $is_utf > 0;
}