- var_dump: documentation ( source)
- json_decode: documentation ( source)
<?php
$jsonObject = '{"subtotal":{"amount":"0.50","currency":"USD"}}';
$jsonObject = json_decode(returnJSON);
$amount = $jsonObject->{'subtotal'}->{'amount'};
$amount_2 = $jsonObject->subtotal->amount;
var_dump($amount);
var_dump($amount_2);