- var_dump: documentation ( source)
- mb_convert_case: documentation ( source)
- mb_strtoupper: documentation ( source)
- strtoupper: documentation ( source)
<?php
class ß {}
class s {}
class SS {}
var_dump(
strtoupper("ß"),
mb_convert_case("ß", MB_CASE_UPPER, "UTF-8"),
mb_strtoupper("ß", "UTF-8")
);