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Question:What is the output of the following code?<?php

function  vec_add (&$a, $b)
{
    $a['x'] += $b['x'];
    $a['y'] += $b['y'];
    $a['z'] += $b['z'];
}

$a = array ('x' => 3, 'y' => 2, 'z' => 5);
$b = array ('x' =>9, 'y' => 3, 'z' => -7);

vec_add ($a, $b);

print_r ($a);

?>

A Array
 (
    [x] => 9
    [y] => 3
    [z] => -7
 ) 
B Array
 (
    [x] => 3
    [y] => 2
    [z] => 5
 ) 
C Array
 (
    [x] => 12
    [y] => 5
    [z] => -2

 ) 
D Error 
E None of the above

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Question:What is the output of the following code?<?php function vec_add (&$a, $b) { $a['x'] += $b['x']; $a['y'] += $b['y']; $a['z'] += $b['z']; } $a = array ('x' => 3, 'y' => 2, 'z' => 5); $b = array ('x' =>9, 'y' => 3, 'z' => -7); vec_add ($a, $b); print_r ($a); ?>

A Array ( [x] => 9 [y] => 3 [z] => -7 )

B Array ( [x] => 3 [y] => 2 [z] => 5 )

C Array ( [x] => 12 [y] => 5 [z] => -2 )

D Error

E None of the above

C

Question:What is the output of the following code?
<?php function vec_add (&$a, $b) { $a['x'] += $b['x']; $a['y'] += $b['y']; $a['z'] += $b['z']; } $a = array ('x' => 3, 'y' => 2, 'z' => 5); $b = array ('x' =>9, 'y' => 3, 'z' => -7); vec_add ($a, $b); print_r ($a); ?>