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userdata.php

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<?php
class UserData
{
    public static $storage = "data.json";
    public $user;
    public $userindex;
    public $userinfo;
    public function __construct($username)
    {
        $this->userinfo = json_decode(file_get_contents(self::$storage), true);
        foreach ($this->userinfo as $i=> $user) {
            if ($user["username"] != $username)
                continue;
            $this->user = $user;
            $this->userindex = $i;
            break;
        }
    }
    public function saveUserData()
    {
        $this->userinfo[$this->userindex] = $this->user;
        file_put_contents(self::$storage, json_encode($this->userinfo, JSON_PRETTY_PRINT));
    }

    public function getBalance(){
        $balance = 0;
        foreach($this->user["balance"] as $transaction){
            $balance += $transaction;
        }
        return $balance;
    }
}
?>