Foreach loops in an array with JSON - php

Question

I've got this PHP code
<?php
$json = file_get_contents('comments.json');
$decode = json_decode($json);
$name = $_POST['name'];
$email = $_POST['email'];
$comment = $_POST['comment'];
foreach($decode->comments as $key)
{
var_dump(array(
$key->name,
$key->email,
$key->comment
));
}
$decode->comments = array(array('name'=>$name, 'email'=>$email, 'comment'=>$comment));
$encode = json_encode($decode,JSON_FORCE_OBJECT);
file_put_contents('comments.json',$encode);
?>
It kind of works, it sets the current stuff in the JSON file to what its told to in this piece of PHP code. Instead of this, I want the PHP code to add on to the JSON that is already existing.
This is the JSON file.
{
"comments": {
"0": {
"name": "123",
"email": "123",
"comment": "123"
}
}
}

Answer 1

Pass a boolean true so you get an associative array instead of an object-based decode:
$json = file_get_contents('comments.json', true);
Change all of your OOP references to associative array style:
foreach($decode['comments'] as $key)
{
var_dump($key); // Declaring a whole new array isn't really needed here
}
Append to the decoded JSON array using the [] syntax:
$decode['comments'][] = array(
'name' => $name,
'email' => $email,
'comment' => $comment,
);
Re-encode and return the resulting JSON:
$encode = json_encode($decode, JSON_FORCE_OBJECT);
file_put_contents('comments.json',$encode);