PHP separate string

Question

I have a string that contains 128.82. I want to split/separate them in 100 and 28.82.

var_dump(substr($kwh,0,3));
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Answer 1

$input = '128.82'; // we’re doing math here, so actually we’ll be working with numbers,
                   // but PHP will automatically cast here
$slabs = [50, 100, 150, 200];

$result = [];
$previous_slab = 0;

foreach($slabs as $slab) {
  // calculate distance between current and previous slab
  $slab_distance = $slab - $previous_slab;
  // if current remainder of input value is >= distance, add distance to result,
  // and subtract distance from remainder of input
  if( $input >= $slab_distance ) {
    $result[] = $slab_distance;
    $input -= $slab_distance;
  }
  // otherwise, add remainder as last item of result, and break out of the loop here
  else {
    $result[] = $input;
    break;
  }
  $previous_slab = $slab;
}

var_dump($result);

Result for the given slabs:

array (size=3)
  0 => int 50
  1 => int 50
  2 => float 28.82

Result for [50, 75, 150, 200]:

array (size=3)
  0 => int 50
  1 => int 25
  2 => float 53.82

Answer 2

If you want to split 128.82 into 100 and 28.82 You can do it like this:

<?php
function calcSlabSize($size) {
    $slab = floor($size / 50)*50;
    return [$slab,$size-$slab];
}

print_r( calcSlabSize(128.82));

This will result in:

Array ( [0] => 100 [1] => 28.82 )