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www.mikescher.com/www/internals/euler.php

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<?php if(count(get_included_files()) ==1) exit("Direct access not permitted.");
class Euler
{
public static function readSingle($f)
{
$a = require $f;
$a['rating'] = self::rateTime($a);
return $a;
}
public static function listAll()
{
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$expr = __DIR__ . '/../statics/euler/Euler_Problem-*.php';
$files = glob($expr);
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return array_map('self::readSingle', $files);
}
public static function rateTime($problem)
{
if ($problem['time'] < 100) // < 100ms
return 0;
if ($problem['time'] < 15 * 1000) // < 5s
return 1;
if ($problem['time'] < 60 * 1000) // < 1min
return 2;
if ($problem['time'] < 5 * 60 * 1000) // < 5min
return 3;
return 4;
}
}