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    <p>In the validation function <code>math_question_page_validate()</code>, you should access the values from $form_state variable, not from $form.</p> <p>eg: </p> <pre><code>if (!$form_state['values']['answer'] == $form_state['values']['total']) { form_set_error('answer', $error); } </code></pre> <p><del>You can also store the answer in $form_state variable to pass it to the validation function (no need to store the value in $form). if you store it as $form_state['total'], you can access it in the same way (given below).</del></p> <p><del>if (!$form_state['total'] == $form_state['values']['answer']) {form_set_error('answer', $error);}</del></p> <p>Thank you very much <a href="https://stackoverflow.com/users/1277693/papirrin">papirrin</a> for teaching <a href="https://stackoverflow.com/a/15308905/1767085">this</a>.</p> <p>I suggest to use variable_get() to keep the correct answer safe. The random value you keep in the form will not survive the form regeneration. </p> <p>My working code here.</p> <pre><code>/** * Builds the form for configuring Math Questions. */ function math_question_page($form, &amp;$form_state) { global $user; $val1 = rand(1,10); $val2 = rand(1,10); $total = $val1 + $val2; // Store the correct answer safely away from this form if (!variable_get('math_question_answer',FALSE)) { variable_set('math_question_answer', $total); } $form['math_question'] = array( '#type' =&gt; 'item', '#markup' =&gt; 'What is ' . $val1 . ' + ' . $val2 . ', ' . check_plain($user-&gt;name) . '?', ); $form['answer'] = array( '#type' =&gt; 'textfield', '#title' =&gt; t('Answer'), ); $form['submit'] = array( '#type' =&gt; 'submit', '#value' =&gt; t('Check my answer'), ); $form_state['redirect'] = FALSE; return $form; } function math_question_page_submit($form, &amp;$form_state) { if (empty($form['answer']['#value'])) { form_set_error('answer', t('This field is required.')); } else { if ($form_state['values']['answer'] == variable_get('math_question_answer')) { $msg = t('Good job!'); $type = 'status'; } else { $msg = t('Try again...'); $type = 'error'; } drupal_set_message(check_plain($msg), $type); } variable_del('math_question_answer'); } </code></pre>
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    1. COI tried changing to $form_state but am still having the same problem, The value for $total is not fixed and changes before it checks for the correct answer.
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      1. USSharon Dankwardt
    2. COIn which array are you storing the variable $total? Post your updated code with $form_state, here in the comments.
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      1. USKevin Siji
    3. COI tried both yo suggestions but this code below has it in $form['total'] `if ($form_state['values']['answer'] == { $form_state['values']['total']) { $msg = t('Good job!'); $type = 'status'; }`
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      1. USSharon Dankwardt
 

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