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accountant.php

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<?php

$file_in = "users.json";
$json = json_decode(file_get_contents($file_in), true);

foreach ($json["users"] as $u){
    $users[] = $u["usn"];
}

foreach($json["users"] as $u){
    if($_POST["c_username"] != $u["usn"]){
        $occupied="N";
    }
    else{
        $occupied="Y";
        break;
    }
}
if($occupied=="Y"){
    header("location: create_account.php?mess=EXISTS");
    exit();
}
else{
    $json["users"][] = ["usn" => $_POST["c_username"], "pwd" => $_POST["c_password"], "status" => "user"];
    $file_out = "users.json";
    $file = fopen($file_out, "w");
    fwrite($file, json_encode($json, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT));
    fclose($file);
    header("location: index.php?mess=CREATED");
    exit();
}

?>