CSPP552: Internet Programming, PHP part 4

Enough talk.. show me an example.

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<title> CSPP505: boring</title>
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Watch the web server waste its time finding all of the prime numbers
between 1 and 1000 in a particularly inefficient way:<p>

1 2 <?
for ($i = 3; $i < 1000; $i += 2) {
    $isprime = 1;
    $j = $i / 2;
    settype($j, "integer");
    while ($j > 2) {
	$q = $i / $j;
	if (intval($q) == $q) {
	    $isprime = 0;
	    break;
	}
	$j--;
    }
    if ($isprime) {
	print "$i ";
    }
}
?>

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