3v4l.org

run code in 200+ php & hhvm versions
<?php $json = '{"details":"http://github.com/adamcooke/vat-rates","version":null,"rates":[{"name":"Spain","code":"ES","country_code":"ES","periods":[{"effective_from":"0000-01-01","rates":{"super_reduced":4.0,"reduced":10.0,"standard":21.0}}]},{"name":"Bulgaria","code":"BG","country_code":"BG","periods":[{"effective_from":"0000-01-01","rates":{"reduced":9.0,"standard":20.0}}]},{"name":"Hungary","code":"HU","country_code":"HU","periods":[{"effective_from":"0000-01-01","rates":{"reduced1":5.0,"reduced2":18.0,"standard":27.0}}]},{"name":"Latvia","code":"LV","country_code":"LV","periods":[{"effective_from":"0000-01-01","rates":{"reduced":12.0,"standard":21.0}}]},{"name":"Poland","code":"PL","country_code":"PL","periods":[{"effective_from":"0000-01-01","rates":{"reduced1":5.0,"reduced2":8.0,"standard":23.0}}]},{"name":"United Kingdom","code":"UK","country_code":"GB","periods":[{"effective_from":"2011-01-04","rates":{"standard":20.0,"reduced":5.0}}]},{"name":"Czech Republic","code":"CZ","country_code":"CZ","periods":[{"effective_from":"0000-01-01","rates":{"reduced":15.0,"standard":21.0}}]},{"name":"Malta","code":"MT","country_code":"MT","periods":[{"effective_from":"0000-01-01","rates":{"reduced1":5.0,"reduced2":7.0,"standard":18.0}}]},{"name":"Italy","code":"IT","country_code":"IT","periods":[{"effective_from":"0000-01-01","rates":{"super_reduced":4.0,"reduced":10.0,"standard":22.0}}]},{"name":"Slovenia","code":"SI","country_code":"SI","periods":[{"effective_from":"0000-01-01","rates":{"reduced":9.5,"standard":22.0}}]},{"name":"Ireland","code":"IE","country_code":"IE","periods":[{"effective_from":"0000-01-01","rates":{"super_reduced":4.8,"reduced1":9.0,"reduced2":13.5,"standard":23.0,"parking":13.5}}]},{"name":"Sweden","code":"SE","country_code":"SE","periods":[{"effective_from":"0000-01-01","rates":{"reduced1":6.0,"reduced2":12.0,"standard":25.0}}]},{"name":"Denmark","code":"DK","country_code":"DK","periods":[{"effective_from":"0000-01-01","rates":{"standard":25.0}}]},{"name":"Finland","code":"FI","country_code":"FI","periods":[{"effective_from":"0000-01-01","rates":{"reduced1":10.0,"reduced2":14.0,"standard":24.0}}]},{"name":"Cyprus","code":"CY","country_code":"CY","periods":[{"effective_from":"0000-01-01","rates":{"reduced1":5.0,"reduced2":9.0,"standard":19.0}}]},{"name":"Luxembourg","code":"LU","country_code":"LU","periods":[{"effective_from":"2016-01-01","rates":{"super_reduced":3.0,"reduced1":8.0,"standard":17.0,"parking":13.0}},{"effective_from":"2015-01-01","rates":{"super_reduced":3.0,"reduced1":8.0,"reduced2":14.0,"standard":17.0,"parking":12.0}},{"effective_from":"0000-01-01","rates":{"super_reduced":3.0,"reduced1":6.0,"reduced2":12.0,"standard":15.0,"parking":12.0}}]},{"name":"Romania","code":"RO","country_code":"RO","periods":[{"effective_from":"2017-01-01","rates":{"reduced1":5.0,"reduced2":9.0,"standard":19.0}},{"effective_from":"2016-01-01","rates":{"reduced1":5.0,"reduced2":9.0,"standard":20.0}},{"effective_from":"0000-01-01","rates":{"reduced1":5.0,"reduced2":9.0,"standard":24.0}}]},{"name":"Estonia","code":"EE","country_code":"EE","periods":[{"effective_from":"0000-01-01","rates":{"reduced":9.0,"standard":20.0}}]},{"name":"Greece","code":"EL","country_code":"GR","periods":[{"effective_from":"2016-06-01","rates":{"reduced1":6.0,"reduced2":13.5,"standard":24.0}},{"effective_from":"2016-01-01","rates":{"reduced1":6.0,"reduced2":13.5,"standard":23.0}},{"effective_from":"0000-01-01","rates":{"reduced1":6.5,"reduced2":13.0,"standard":23.0}}]},{"name":"Lithuania","code":"LT","country_code":"LT","periods":[{"effective_from":"0000-01-01","rates":{"reduced1":5.0,"reduced2":9.0,"standard":21.0}}]},{"name":"France","code":"FR","country_code":"FR","periods":[{"effective_from":"2014-01-01","rates":{"super_reduced":2.1,"reduced1":5.5,"reduced2":10.0,"standard":20.0}},{"effective_from":"2012-01-01","rates":{"super_reduced":2.1,"reduced1":5.5,"reduced2":7.0,"standard":19.6}},{"effective_from":"0000-01-01","rates":{"super_reduced":2.1,"reduced1":5.5,"standard":19.6}}]},{"name":"Croatia","code":"HR","country_code":"HR","periods":[{"effective_from":"0000-01-01","rates":{"reduced1":5.0,"reduced2":13.0,"standard":25.0}}]},{"name":"Belgium","code":"BE","country_code":"BE","periods":[{"effective_from":"0000-01-01","rates":{"reduced1":6.0,"reduced2":12.0,"standard":21.0,"parking":12.0}}]},{"name":"Netherlands","code":"NL","country_code":"NL","periods":[{"effective_from":"2012-10-01","rates":{"reduced":6.0,"standard":21.0}},{"effective_from":"0000-01-01","rates":{"reduced":6.0,"standard":19.0}}]},{"name":"Slovakia","code":"SK","country_code":"SK","periods":[{"effective_from":"0000-01-01","rates":{"reduced":10.0,"standard":20.0}}]},{"name":"Germany","code":"DE","country_code":"DE","periods":[{"effective_from":"0000-01-01","rates":{"reduced":7.0,"standard":19.0}}]},{"name":"Portugal","code":"PT","country_code":"PT","periods":[{"effective_from":"0000-01-01","rates":{"reduced1":6.0,"reduced2":13.0,"standard":23.0,"parking":13.0}}]},{"name":"Austria","code":"AT","country_code":"AT","periods":[{"effective_from":"2016-01-01","rates":{"reduced1":10.0,"reduced2":13.0,"standard":20.0,"parking":13.0}},{"effective_from":"0000-01-01","rates":{"reduced":10.0,"standard":20.0,"parking":12.0}}]}]}'; $array = json_decode($json,1); foreach($array['rates'] as $k=>$v){ echo $v['periods'][0]['rates']['standard'].PHP_EOL; } // print_r($array);
based on YtRT1
Output for 7.1.25 - 7.3.2
21 20 27 21 23 20 21 18 22 22 23 25 25 24 19 17 19 20 24 21 20 25 21 21 20 19 23 20