Online PHP editor | output for nJHgO

<?php $json = '[ { "surname": "", "name": "Andrea Fiore", "city": "Crocino", "address": "via Emo Mannucci, 2", "telephone": "123456789", "email": "x@gmail.com", "startData": "2019-07-04", "finishData": "2019-07-25", "cardId": "2", "state": "true" } ]'; $data = json_decode($json, true); $filter = array_filter($data, function($row) { return $row['email'] == 'x@gmail.com'; }); if(count(($indexs = array_keys($filter))) == 1) { $data[$indexs[0]] = array( 'foo' => 'bar', ); } var_dump($data);