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'Guess a number' - Help with hidden fields and arrays

Go to solution Solved by ginerjm,

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Hello! I'm rookie.


Please help me to solve problem with storing stuff in hidded fields for 'Guess a number' program:
Why this...

if ($choice == 'big'){
print $guess[1]=($guess[0] / 2);
} elseif ($choice == 'small') {
print $guess[2]=($guess[0] + 25); 

...doesn't work?



I know that it's the worst decision to use arrays and hidden fields in such program; but I've made decision to make it like this and can't drop it :) Please help!



This is my live stream, how I made this program - https://www.youtube.com/watch?v=lLQ4J2JkO60 

Edited by tangar
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ginerjm, thank you very much! :D I though I had all errors on, but it seems NOTICE was off. With this:
ini_set('display_errors', '1');
I saw notices:

Notice: Undefined index: $guess in C:\OpenServer\domains\localhost\php\17.php on line 6

Notice: Undefined index: $choice in C:\OpenServer\domains\localhost\php\17.php on line 7
Is your number 50?


So I understand that got troubles with forms.
And after I worked some time, I noticed that I got silly error:
$guess = $_POST['$guess'];
It has to be:
$guess = $_POST['guess'];
So, what I got now, it works as intended:
Thank you, guys!
Edited by tangar
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Here's the example code of your game. I will leave it up to you to improve it and make sure it does not repeat a number.



// game variables
$game_is_started     = false;
$game_is_won         = false;
$game_is_lost        = false;
$game_pc_guesses     = [];
$game_pc_range       = [];
$game_last_guess     = null;
$game_number_low     = 1;
$game_number_high    = 10;
$game_allow_guesses  = 5;
$game_total_guesses  = 0;
$game_p1_win         = 0; // computer
$game_p2_win         = 0; // player
// end game variables

  $game_number_low    = intval($_POST['number_low']);
  $game_number_high   = intval($_POST['number_high']);
  $game_allow_guesses = intval($_POST['allow_guesses']);
  $game_p1_win        = intval($_POST['p1_win']);
  $game_p2_win        = intval($_POST['p2_win']);

  if ($game_number_high < $game_number_low) {
    list($game_number_low, $game_number_high) = [

  $game_is_started = true;
  if (array_key_exists('start', $_POST)) {
    $game_last_guess = mt_rand($game_number_low, $game_number_high);
  } else if (array_key_exists('last_result', $_POST)) {
    if (array_key_exists('pc_guesses', $_POST)) {
      $game_pc_guesses = array_map('intval', $_POST['pc_guesses']);
    } else {
      $game_pc_guesses = [];
    $game_last_guess    = intval($_POST['last_guess']);
    $game_total_guesses = intval($_POST['total_guesses']) + 1;

    array_push($game_pc_guesses, $game_last_guess);

    if ($game_total_guesses > $game_allow_guesses) {
      $game_is_lost = true;
      $game_p2_win  = $game_p2_win + 1;
    } else {
      switch ($_POST['last_result']) {
        case 'bigger':
          $game_last_guess = ($game_last_guess === $game_number_high || ($game_last_guess + 1 === $game_number_high))
            ? mt_rand($game_number_low, $game_number_high)
            : mt_rand($game_last_guess + 1, $game_number_high);
        case 'smaller':
          $game_last_guess = ($game_last_guess === $game_number_low || ($game_last_guess - 1 === $game_number_low))
            ? mt_rand($game_number_low, $game_number_high)
            : mt_rand($game_number_low, $game_last_guess - 1);
        case 'won':
          $game_is_won = true;
          $game_p1_win = $game_p1_win + 1;


<h1>Computer: <?= $game_p1_win ?>, Player: <?= $game_p2_win ?></h1>

<?php if ($game_is_started && !($game_is_won || $game_is_lost)): ?>
  <form action="#" method="post">
      <input type="hidden" name="is_started" value="<?= $game_is_started ?>">
      <input type="hidden" name="number_low" value="<?= $game_number_low ?>">
      <input type="hidden" name="number_high" value="<?= $game_number_high ?>">
      <input type="hidden" name="allow_guesses" value="<?= $game_allow_guesses ?>">
      <input type="hidden" name="total_guesses" value="<?= $game_total_guesses ?>">
      <input type="hidden" name="last_guess" value="<?= $game_last_guess ?>">
      <input type="hidden" name="p1_win" value="<?= $game_p1_win ?>">
      <input type="hidden" name="p2_win" value="<?= $game_p2_win ?>">
      <?php foreach ($game_pc_guesses as $guess): ?>
        <input type="hidden" name="pc_guesses[]" value="<?= $guess ?>">
      <?php endforeach ?>
      <p>Is your number <?= $game_last_guess ?>?</p>
      <button type="submit" name="last_result" value="bigger">No, my number is bigger!</button>
      <button type="submit" name="last_result" value="won">Yup, that's my number!</button>
      <button type="submit" name="last_result" value="smaller">No, my number is smaller!</button>
<?php else: ?>
  <?php if ($game_is_won): ?>
    <h2>I win! ^^</h2>
  <?php elseif ($game_is_lost): ?>
    <h2>You win!</h2>
  <?php endif ?>
  <form action="#" method="post">
      <input type="hidden" name="p1_win" value="<?= $game_p1_win ?>">
      <input type="hidden" name="p2_win" value="<?= $game_p2_win ?>">
      <h2>Hello, do you wanna play <?= $game_is_won ? 'another' : 'a' ?> game?</h2>
        Yes, find my number between <input type="number" name="number_low" value="<?= $game_number_low ?>">
        and <input type="number" name="number_high" value="<?= $game_number_high ?>">.
      <p>You have <input type="number" name="allow_guesses" value="<?= $game_allow_guesses ?>"> guesses.</p>
      <input type="submit" name="start" value="Play!" style="font-size:big">
<?php endif ?>
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