Can't change value in json - php

Question

I have a .json file with player name, mail address, field name and score on that field. Like this:
{"0":{"name":"test","password":"test","mail":"test#test.test","test3":0,"test2":0},"1":{"...
I want to change the score at one field, but I can't. I tried this way:
$jsonn = file_get_contents('data/userdata.json');
$arrayy = json_decode($jsonn, true);
$field = $_SESSION['fieldname'];
$arrayy[$felhasznev][$palya] = $pontszam;
And I also tried this but not helped:
$jsonn = file_get_contents('data/userdata.json');
$arrayy = json_decode($jsonn, true);
$field = $_SESSION['fieldname'];
foreach ($arrayy as $key => $valuee){
if($valuee['name'] == $username){
$valuee[$field] = $score;
}
}
I'm beginner in JSON so maybe something trivial...

Answer 1

Function json_decode parse json file to objects, you're using associative array, to have an associative array you have to pass a second argument as true, like:
<?php
$file = file_get_contents("file.json");
$players = json_decode($file, true);
$err = json_last_error();
if ($err != JSON_ERROR_NONE) {
print_r($err);
die("Error in json file :/");
}
var_dump($players);
foreach ($players as $key => $val) {
if ($players[$key]["name"] == "test") {
$players[$key]["test3"] = $players[$key]["test3"] + 1;
$players[$key]["test2"] = $players[$key]["test2"] + 1;
}
}
var_dump($players);
file_put_contents("new_file.json", json_encode($players));

Answer 2

(1) In your sample json, there is value (0) not enclosed in double quote (parsing error!).
(2) the first code should work if json is ok.
(3) in the second code, you skipped the "id" identifier (if json is ok).