function isChar($s)
{
return isLower($s) || isUpper($s);
}
/**
* Makes a case swapped version of the string
* @param string $string the input string
* @param boolean $mb to use or not to use multibyte character feature
* @return string case swapped version of the input string
*
* @author Rod Elias <*****@*****.**>
*/
function swapCase($string, $mb = false)
{
return array_reduce(str_split($string), function ($carry, $item) use($mb) {
return $carry .= isLower($item, $mb) ? toUpper($item, $mb) : toLower($item, $mb);
}, '');
}
