Online PHP editor | output for eI29a

<?php $json = '{ "shops": [ { "shop_id": "100", "locations": [ { "location_id": "100_1", "distance": "10.3" }, { "location_id": "100_2", "distance": "15.2" } ] }, { "shop_id": "101", "locations": [ { "location_id": "101_1", "distance": "19.3" }, { "location_id": "101_2", "distance": "12.4" } ] }] }'; // Decode the JSON data $json_data = json_decode($json,true); // Do a foreach loop foreach($json_data['shops'] as $shops) { $distances = array_column($shops['locations'], 'distance','location_id'); asort($distances); echo key($distances) . ' -> ' . current($distances) . "\n"; }