PHP将数据添加到json文件

Question

I try to add data to a json file.

First try:

$filename = "$root/nachrichten/bla.json";

$neueartikel = json_decode(file_get_contents($filename), true); /*until here everything works, I can loop the file*/

$neueartikel[] = array('titel' => 'bla',
                    'bild' => 'bla',
                    'url' => 'bla',
                    'ID' => 'bla',
                    'bildserver' => 'bla'); 

file_put_contents('$root/nachrichten/bla.json', json_encode($neueartikel);

Second try:

$filename = "$root/nachrichten/bla.json";

$neueartikel = json_decode(file_get_contents($filename), true);

$neu[] = array('titel' => 'bla',
                    'bild' => 'bla',
                    'url' => 'bla',
                    'ID' => 'bla',
                    'bildserver' => 'bla');

$result = array_merge($neueartikel, $neu);

file_put_contents('$root/nachrichten/bla.json', json_encode($result);

How can I do this right????

UPDATE:

I also tryed what PotatoIng sayd:

$filename = "$root/nachrichten/bla.json";

    $temparray = json_decode(file_get_contents($filename), true);

    $neu = array('titel' => 'bla',
                        'bild' => 'bla',
                        'url' => 'bla',
                        'ID' => 'bla',
                        'bildserver' => 'bla');

    array_push($temparray, $neu);

    file_put_contents("$root/nachrichten/bla.json", json_encode($temparray);

Still nothing (ignore this text I need to add some or else I can't submit -.-)

Answer 1

Basic PHP: '-quoted strings do NOT interpolate variables:

file_put_contents('$root/nachrichten/bla.json', json_encode($neueartikel);
                  ^^^---

Your code is trying to write your file out to a directory whose name is literally $, r, o, etc...

Use "-quoted strings instead.