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parameter_mystery2

Language/Type: PHP parameter mystery parameters

The following console program uses parameters and produces three lines of output. What are they? 

function mystery($c, $a, $b) {
    print("$b + $c = $a\n");
}

$a = 4;
$b = 7;
$c = -2;

mystery($a, $b, $c);
mystery($c, 3, $a);
mystery($a + $b, $b + $c, $c + $a);
line 1
line 2
line 3

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