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<?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") );
Output for 4.3.0 - 7.1.0
string(2) "ß" string(2) "ß" string(2) "ß"