function subString($str, $start = 0, $length = null, $encoding = 'UTF-8')
{
if ($length === null) {
$length = AJAXChatString::stringLength($str);
}
if (function_exists('mb_substr')) {
return mb_substr($str, $start, $length, $encoding);
} else {
if (function_exists('iconv_substr')) {
return iconv_substr($str, $start, $length, $encoding);
} else {
return substr($str, $start, $length);
}
}
}
function stringLength($str, $encoding = 'UTF-8')
{
return AJAXChatString::stringLength($str, $encoding);
}