var 10..., PHP, Web Development

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;