What will be the output of the following PHP code ?<?phpfunction

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What will be the output of the following PHP code ?

<?php
function fun($str)
    {
        echo "my favourite fun time is ".$str;
        function m()
        {
            echo " to spend with friends";
        }
    }
m();
?>

1. my favourite fun time is
2. Nothing
3. to spend with friends
4. Error
5. my favourite fun time is to spend with friends

Correct Option: D

m is undeclared if fun() is not called first.