Price break quantity for PHP

Question

I have a array object like this

"PriceBreaks": [
  {
    "Quantity": 1,
    "Price": "$12.10",
    "Currency": "USD"
  },
  {
    "Quantity": 5,
    "Price": "$11.76",
    "Currency": "USD"
  },
  {
   "Quantity": 10,
   "Price": "$11.42",
   "Currency": "USD"
  },
  {
    "Quantity": 25,
    "Price": "$10.75",
    "Currency": "USD"
  }
],

I want to calculate the price based on quantity like json above. My expected output like this

+ Quantity is 1 => price is $ 12.10
+ Quantity is 4 => price is 4 * $ 12.10
+ Quantity is 5 => price is 5 * $ 11.76
+ Quantity is 8 => price is 8 * $ 11.76

Any Help would be appreciated and thanks in Advance

Answer 1

Here is another approach you may use for inspiration. See the comments for details.

<?php

// Raw JSON
$json = '[
  {
    "Quantity": 1,
    "Price": "$12.10",
    "Currency": "USD"
  },
  {
    "Quantity": 5,
    "Price": "$11.76",
    "Currency": "USD"
  },
  {
   "Quantity": 10,
   "Price": "$11.42",
   "Currency": "USD"
  },
  {
    "Quantity": 25,
    "Price": "$10.75",
    "Currency": "USD"
  }
]';

// Convert JSON to array using the quantity as the index.
$offers = [];
// TRUE to convert to associative array.
foreach (json_decode($json, TRUE) as $offer)
{
    // Let's get a float for the calculations instead of the string.
    $offer['Price'] = +substr($offer['Price'], 1);
    // Store as quantity => offer.
    $offers[$offer['Quantity']] = $offer;
}

// The number of items to be purchased.
$customerQuantity = 10;

// max(1, ...) will ensure that the key will never go below 1.
// floor($customerQuantity / 5) * 5 to get to the nearest boundary. This assumes that quantities are always a multiple of 5!
echo $offers[max(1, floor($customerQuantity / 5) * 5)]['Price'] * $customerQuantity;