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`functions.php`

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<?php
date_default_timezone_set('CET');

function add($filename, $account, $type, $amount){ //Lägger till en transaktion i transaktions arrayen i ett visste konto i användarens personliga fil.
    $file_in = "accounts/".$filename.".json";
    $userfile = json_decode(file_get_contents($file_in), true);
    foreach ($userfile['accounts'] as &$a){
        if($a['name'] == $account){
            $transactions = $a['transactions'];
            $balance = 0;
            for($i = 0; $i <= (count($transactions)-1); $i+=3){
                $balance += $transactions[$i+2];
            }
            if(($balance + $amount) < 0){
                header('location: home.php'); 
                exit;
            }
            array_push($transactions, $type, date("Y-m-d"), (int)$amount);
            $a['transactions'] = $transactions;
        }
    }

    $file = fopen($file_in, "w");
    fwrite($file, json_encode($userfile, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT));
    fclose($file);
}

?>