x 4 function assignx 0 printf inside is d outside..., PHP Arrays, PHP

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Question:$x = 4;
function assignx () {
$x = 0;
printf("$x inside function is %d", $x);
}
assignx();
printf("$x outside of function is %d", $x);
Executing this listing results in the following:

A $x inside function is 0
$x outside of function is 4 
B $x inside function is null
$x outside of function is null 
C $x inside function is 04
$x outside of function is 40 
D none

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Question:$x = 4; function assignx () { $x = 0; printf("$x inside function is %d", $x); } assignx(); printf("$x outside of function is %d", $x); Executing this listing results in the following:

A $x inside function is 0 $x outside of function is 4

B $x inside function is null $x outside of function is null

C $x inside function is 04 $x outside of function is 40

D none

A