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<?php setlocale(LC_ALL, "Turkish"); $str="i"; $res=strtoupper($str); var_dump([ "str"=>$str, "str_hex"=>bin2hex($str), "res"=>$res, "res_hex"=>bin2hex($res), ]);
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { ["str"]=> string(1) "i" ["str_hex"]=> string(2) "69" ["res"]=> string(1) "I" ["res_hex"]=> string(2) "49" }

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