Why does JSON decoding return null?

Question

PHP

json decoding returns null. I tried to convert to utf8 but it did not help, I used all the options that are possible. json_last_error() returns 4. Please help.

$str = file_get_contents("data.json");
$file = json_decode($str);
var_dump($file);

{"login":"igor","password":"qwerty"}
{"login":"igor","password":"qwerty"}
{"login":"igor","password":"qwerty"}

Answer 1

Not valid json, multiple root elements.

[
   {
      "login":"igor",
      "password":"qwerty"
   },
   {
      "login":"igor",
      "password":"qwerty"
   },
   {
      "login":"igor",
      "password":"qwerty"
   }
]

Answer 2

First, read your file line by line, and only then decode these lines in a loop:

<?php

// Показ ошибок:
ini_set('error_reporting', E_ALL);
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);

// Кодировка документа для браузера:
header('Content-Type: text/plain; charset=UTF-8');

$arr = file('data.json'); // Читаем файл в массив построчно

// Раскодируем строки как JSON и записываем обратно в массив:

foreach ($arr as &$val) {
    $val = json_decode($val,  true);
}


print_r($arr); // Выводим результат