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parameter_mystery5

Language/Type: PHP parameter mystery parameters return

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

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

$a = 5;
$b = 1;
$c = 3;
$three = $a;
$one = $b + 1;

axiom($a, $b, $c);
axiom($c, $three, 10);
$three = axiom($b + $c, $one + $three, $a + $one);
$a++;
$b = 0;
$a = axiom($three, 2, $one);
line 1
line 2
line 3
line 4

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