what will be the output of following code var 10function fn..., PHP Fundamentals, PHP

Question:What will be the output of the following code?
$var = 10;
function fn()
{
   $var = 20;
   return $var;
}
fn();
echo $var;

A 10 
B 20 
C Undefined Variable 
D Syntax Error

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Question:What will be the output of the following code?$var = 10;function fn(){ $var = 20; return $var;}fn();echo $var;