<?php

if (isset($_POST['submit'])) {

    $twitchArray = array(
        "TwitchName" => $_POST['twitchName'],
        "TwitchHref" => $_POST['twitchHref'],
        "TwitchDescription" => $_POST['twitchDescription']
    );

    $json = json_encode($twitchArray);

    $file = 'twitch.json';

    file_put_contents($file, $json);

    echo json_decode('twitch.json');
}
?>