PHP Program To Convert Character Cases

Write PHP Program to convert a character from upper to lower and lower to upper case

<!-- Write a programme to convert upper case letter to lower case and lower case to upper-->

            $n1 = 'c';
            $upper = strtoupper($n1);
            echo "The Upper case of ".$n1." : ".$upper;
            $n2 = 'Z';
            $lower = strtolower($n2);
            echo "<br>The Lower case of  ".$n2.": ". $lower;


The Upper case of c : C
The Lower case of Z : z

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