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Language/Type: PHP parameter mystery parameters return

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

function surprise($y, $x) {
    print("$x $y\n");
    return $x;

$x = 5;
$y = 1;
$z = 9;
$w = $y + 2;

surprise($x, $y);
$x = surprise($z, $w);
$z = surprise($w, $x);
surprise($y, $z);
line 1
line 2
line 3
line 4

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