Unicode Ranger

try
{

    $value      = 'aBcDeFgHiJkLmNoPqRsTuVwXyZbarbäzföoßĐIJᾕ₱❶❷❸ㅳㅵㅸㅘㄸ㊁㚂㹂䜢';

    $string     = (new DataTypeString($value))->toUpper();
    $charArray  = $string->toCharArray();
    $range      = (new DataTypeCharArraySegment($charArray, 10, 10))->toLower();

    $iterator   = new Bits(DataTypeStringArray::IT_MODE_LO);
    $reversed   = new DataTypeArray($range, $iterator);

    print "input\n";
    print $value;
    print "\n\n";
    print "input->uppercase()\n";
    print $string;
    print "\n\n";
    print "input->toCharArray()->range(10,10)->toLower()\n";
    print "important: range is not a copy of charArray!\n";
    foreach($charArray as $c) print $c; // prints barbäzföoßĐIJᾝ₱❶❷❸ㅳㅵㅸㅘㄸ㊁㚂㹂䜢
    print "\n\n";
    print "iterate range\n";
    foreach($range as $c) print $c; // prints ĐIJᾕ₱❶❷❸ㅳㅵㅸ
    print "\n\n";
    print "iterate as FILO\n";
    foreach($reversed as $c) print $c; // prints ㅸㅵㅳ❸❷❶₱ᾕIJĐ
    print "\n\n";

}
catch(\ILLI\Exception\Base $e)
{
    print $e->export()->asText();
}
catch(\Exception $e)
{
    var_dump($e);
}
/* result:


input
aBcDeFgHiJkLmNoPqRsTuVwXyZbarbäzföoßĐIJᾕ₱❶❷❸ㅳㅵㅸㅘㄸ㊁㚂㹂䜢

input->uppercase()
ABCDEFGHIJKLMNOPQRSTUVWXYZBARBÄZFÖOßĐIJᾝ₱❶❷❸ㅳㅵㅸㅘㄸ㊁㚂㹂䜢

input->toCharArray()->range(10,10)->toLower()
important: range is not a copy of charArray!
ABCDEFGHIJklmnopqrstUVWXYZBARBÄZFÖOßĐIJᾝ₱❶❷❸ㅳㅵㅸㅘㄸ㊁㚂㹂䜢

iterate range
klmnopqrst

iterate as FILO
tsrqponmlk