Question

I have this piece of code that loops 1 through 99 and is a formula.

function getExperienceByLevel ($maxLevel)
{
    $levels = array ();
    $current = 0;

    for ($i = 1; $i <= $maxLevel; $i++)
    {
        $levels[$i - 1] = floor ($current / 4);
        $current +=  floor($i+300*pow(2, ($i/9.75)));
    }

    return $levels;
}

First you initiate it like so $aLevels = getExperienceByLevel(99); then to see how much EXP you need to get to level 6 you do this echo $aLevels[5]; since it’s an array.

Now I’m trying to do reverse. Get Level by EXP.

function getLevelByExp($exp) 
{
    $aLevels = getExperienceByLevel(99);

    for ($i = 1; $i < 100; $i++)
    {
        if ($exp > $aLevels[$i-1]) 
        { 
            return $i;
        }
    }
}

So I try to do this:

$aLevels = getExperienceByLevel(99);
echo getLevelByExp(131);

When called upon getLevelByExp(131); or any number inside, it seems to return a 1 even though it should be 2 since Level 3 is 167 EXP and Level 2 is 80 EXP. Here’s a reference image: http://i.imgur.com/gEYgu.png

Answer 1

You are doing two mistakes: You are indexing your levels array wrong. And you’re checking it the wrong way. Use this:

http://codepad.viper-7.com/MGpOUu

function getExperienceByLevel($maxLevel) {
    $levels = array ();
    $current = 0;
    for ($i = 1; $i <= $maxLevel; $i++) {
        $levels[$i] = floor ($current / 4);
        $current +=  floor($i+300*pow(2, ($i/9.75)));
    }
    return $levels;
}

function getLevelByExp($exp)  {
    $levels = getExperienceByLevel(99);
    $current = 0;
    foreach($levels as $level => $required) {
        if($required>$exp)return $current;
        $current = $level;
    }
    return $current;
}

echo getLevelByExp(131);

// returns 2