- var_dump: documentation ( source)
- json_decode: documentation ( source)
<?php
$string = '{"4":{"virtuemart_calc_id":4,"calc_name":"MwSt. 7%","calc_value":"7.0000","result":0.1498133},"3":{"virtuemart_calc_id":3,"calc_name":"MwSt. 19%","calc_value":"19.0000" ,"result":0.7904}}';
$array = json_decode($string);
var_dump($array);