<?php
 
function scanSystem($x, $y) {
    echo 'You arrive at space corridor ' . $x . ', ' . $y . ".\n";
 
    // Init the RNG based on the coordinates.
    // The added math is there to not have a universe mirrored at the diagonal
    // through sectors II/IV.
    srand(($x << 4) | $y);
 
    $empty = rand(0, 100) > 20;
 
    if ($empty) {
    	echo 'There is nothing here.' . "\n";
    	return;
    }
 
    $type = rand(0, 20);
    if ($type > 9) {
	    echo 'It\'s some kind of anomaly.' . "\t";
	    return;
    }
 
    $planets = rand(0, 10);
    echo 'It\'s a class ' . ($type + 1) . ' star with ' . ($planets ? $planets : 'no') . ' planets.' . "\n";
    echo '-- scan complete --' . "\n\n";
}
 
// Let's do some scans
scanSystem(4, 1);
scanSystem(42, 12);
scanSystem(12, 88);

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