PHP - Number of units between two numbers - php

Question

I'm trying to find the number of units between 2 numbers that are under zero between 0 and a limit and over that limit. Here is my function. It works fine until I have to work with some huge numbers which takes a lot of time to process. I am trying to find a way to execute this code without using a loop.
public function getBetween($num1, $num2) {
$limit = 500000;
$array = array(0,0,0);
if ($num1 >= $num2) {
$low = $num2;
$high = $num1;
} else {
$low = $num1;
$high = $num2;
}
for($i=$low; $i < $high; $i++) {
if ($i < 0) {
$array[0]++;
} elseif ($i >= 0 && $i < $limit) {
$array[1]++;
} else {
$array[2]++;
}
}
return $array;
}
I have started to split my loop into elseif statements but this is getting messy really quick and I will also have to eventually be able to set more than one limit which will become impossible to use.
if ($low < 0 && $high < 0) {
} elseif ($low < 0 && $high >= 0 && $high < $limit) {
} elseif ($low < 0 && $high >= $limit) {
} elseif ($low >= 0 && $low < $limit && $high < 0) {
} elseif ($low >= 0 && $low < $limit && $high >= 0 && $high < $limit) {
} elseif ($low >= 0 && $low < $limit && $high >= $limit) {
} elseif ($low >= $limit && $high < 0) {
} elseif ($low >= $limit && $high >= 0 && $high < $limit) {
} elseif ($low >= $limit && $high >= $limit) {
}
I am trying to find a clean way to do it. Any ideas?
EDIT
Here is an example of the array I'm trying to get.
If my limit was 500, $num1 = -100 and $num2 = 700 i would get the array
$array[0] = 100
$array[1] = 500
$array[2] = 200

Answer 1

I didn't test it (didn't run a PHP script but I tried it "manually" with a few examples).
You still have loops, but only one iteration per limit (instead of one per unit).
// Example datas
$limits = array(0, 500, 800);
$low = -100;
$high = 1000;
$splittedResults = array();
// Get total of units
$totalUnits = abs($high - $low);
$totalCounted = 0;
foreach($limits as $limit) {
if ($low > $limit) {
// Nothing under the limit
$nbUnderLimit = 0;
} elseif($high < $limit) {
// Both values under the limit
$nbUnderLimit = $totalUnits;
} else {
// $low under the limit and $high over it
$nbUnderLimit = abs($limit - $low);
}
// Here we know how much units are under current limit in total.
// We want to know how much are between previous limit and current limit.
// Assuming that limits are sorted ascending, we have to remove already counted units.
$nbBetweenLimits = $nbUnderLimit - $totalCounted;
$splittedResults[] = $nbBetweenLimits;
$totalCounted += $nbBetweenLimits;
}
// Finally, number of units that are over the last limit (the rest)
$splittedResults[] = $totalUnits - $totalCounted;

Answer 2

You could create an array of the numbers with range() and use array_filter
$count = sizeof(array_filter (range(0,800), function($value){ return ($value > 500); }));
And one for < as well etc.
You only need to define range array once, separately.