<?php

$urlwithjson = 'http://www.example.com/url-with-json-code-field1value-field2value-field3value';
$downloadcontent = file_get_contents($urlwithjson);
$json = json_decode($downloadcontent, true);

foreach($json['jsonroot'] as $item) {
print $item['one'];
print $item['two'];
print $item['three'];
}

?>

{"jsonroot": [
{"one": "1", "two": "2", "three": "3"}
]}