php game class. lets you get levels and points

Game.php

<?php

class Game
{
  public static function pointsFromLevel($level)
	{
		// http://rsdo.net/rsdonline/guides/Experience%20formula.html#PHP
		$a = 0;
		for($x = 1; $x < $level; $x++) {
			$a += floor($x + 300 * pow(6, ($x / 7)));
		}

		if ($a > 0)
			return floor($a / 2);

		return 0;
	}

	public static function levelFromPoints($points)
	{
		for ($i = 0; $i < 200; ++$i) {
			$pointsCheck = self::pointsFromLevel($i);
			if ($points > $pointsCheck && $points < self::pointsFromLevel($i + 1))
				return $i;
		}

		return 1;
	}

	public static function percentRemaining($points)
	{
		$currentLevel = self::levelFromPoints($points);
		$nextLevelPoints = self::pointsFromLevel($currentLevel + 1);

		$levelProgress = $nextLevelPoints - $points;
		$levelDifference = $nextLevelPoints - self::pointsFromLevel($currentLevel);

		return 100 - floor($levelProgress / $levelDifference * 100);
	}
}

Nice, wrote it yourself? :P