I have this .json file:

[
    {
        "id": 1,
        "title": "Ben\\'s First Blog Post",
        "content": "This is the content"
    },
    {
        "id": 2,
        "title": "Ben\\'s Second Blog Post",
        "content": "This is the content"
    }
]

This is my PHP code:

<?php
$data[] = $_POST['data'];

$fp = fopen('results.json', 'a');
fwrite($fp, json_encode($data));
fclose($fp);

The thing is, I'm not exactly sure how to achieve it. I'm going to call this code above every time a form is submitted, so I need the ID to increment and to also keep the valid JSON structure with [ and {, is this possible?

php json
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