Get number by loop on if - PHP - php

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

function getLevelByExp($exp) {
$aLevels = getExperienceByLevel(99);
for ($i = 99; $i >= 1; $i--)
{
if ($exp > $aLevels[$i-1])
{
return $i;
}
}
}
You are returning as soon as $exp > $aLevels[$i-1]. On the first runthrough of your original loop, $aLevels[$i-1] = $aLevels[0] = 0, so it will always return right away for any non-negative $exp value.

Answer 2

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

Answer 3

change
if ($exp > $aLevels[$i-1])
to
if ($exp > $aLevels[$i-1] && $exp < $aLevels[$i])
checked and it is working
working example http://codepad.viper-7.com/BjmHad

Answer 4

You need the opposite conditional, and to compare to the next level, so you can determine that a given exp level does not fit into any higher level. This code works for me:
if ($exp < $aLevels[$i])
{
return $i;
}
Nice and simple. Try it out: http://codepad.viper-7.com/FrjtHT

Answer 5

I think you should do it like
function getLevelByExp($exp)
{
$aLevels = getExperienceByLevel(99);
for ($i = 1; $i < count($aLevels); $i++)
{
if ($exp >= $aLevels[$i-1] && ($exp - $aLevels[$i-1] < $aLevels[$i] - $aLevels[$i-1]))
{
return $i;
}
}
}
Check out http://www.phpfiddle.org/main/code/paw-08f