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);

?>

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