Description:
------------
http://php.net/manual/en/intlchar.chr.php
There is a typo in the output example.
The 2nd line should be 'string(1) "?"' instead of 'string(1) "A"'.

https://3v4l.org/ggakS

Test script:
---------------
<?php
$values = ["A", 63, 123, 9731];
foreach ($values as $value) {
    var_dump(IntlChar::chr($value));
}

Expected result:
----------------
string(1) "A"
string(1) "?"
string(1) "{"
string(3) "☃"

Actual result:
--------------
string(1) "A"
string(1) "A"
string(1) "{"
string(3) "☃"