/**
* This is a unicode aware replacement for substr()
*
* Uses mb_string extension if available
*
* @author Andreas Gohr <*****@*****.**>
* @see substr()
*/
static function utf8_substr($str, $start, $length = null)
{
if (function_exists('mb_substr')) {
return mb_substr($str, $start, $length, 'utf-8');
}
$uni = UTF8::utf8_to_unicode($str);
return UTF8::unicode_to_utf8(array_slice($uni, $start, $length));
}