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($str)
    {
        echo "Hello ".$str;
        function m()
        {
            echo "\nBlock m executed...";
        }
    }
fun("Interview Mania");
m();
?>

1. Error
2. Hello Interview Mania
3. Block m executed...
4. Hello Interview Mania
  Block m executed...
5. None of these

Correct Option: D

m is declared as fun() is executed first.