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$x = 'computer'; echo "Conversion of '$x' to '" . strtoupper($x) . "'.\n"; // Note that the range of lowercase letters that can be converted to uppercase, is limited by the current locale. // Use mb_strtolower() or mb_convert_case() if you need to be able to convert all uppercase letters in the Unicode set. // Note also that strtoupper() may have been re-defined as an alias of mb_strtoupper by setting the value of // mbstring.func_overload in php.ini.