<p>STEP 3 of 5: Enter disease priors.</p><?php$num_diseases   = $_POST["num_diseases"];$num_symptoms   = $_POST["num_symptoms"];$disease_labels = $_POST["disease_labels"];$symptom_labels = $_POST["symptom_labels"];$priors         = $_POST["priors"];$likelihoods    = $_POST["likelihoods"];?><table cellpadding='3' cellspacing='0' border='0'>  <form method='post' action='<?php echo $PHP_SELF; ?>'>  <input type='hidden' name='next_step' value='4'>  <input type='hidden' name='num_diseases' value='<?php echo $num_diseases; ?>'>    <input type='hidden' name='num_symptoms' value='<?php echo $num_symptoms; ?>'>    <?php   for ($h=0; $h < $num_diseases; $h++) {      echo "<input type='hidden' name='disease_labels[]' value='$disease_labels[$h]'>";    }  for ($h=0; $h < $num_symptoms; $h++) {        echo "<input type='hidden' name='symptom_labels[]' value='$symptom_labels[$h]'>";     }  for ($h=0; $h < $num_diseases; $h++) {      for ($e=0; $e < $num_symptoms; $e++) {       $value = $likelihoods[$h][$e];          echo "<input type='hidden' name='likelihoods[$h][$e]' value='$value'>\n";      }  }    for ($h=0; $h < $num_diseases; $h++) {    ?>    <tr>      <td align='right'>Prior probability of <?php echo $disease_labels[$h]; ?></td>      <td><input type='text' name='priors[]' value='<?php echo $priors[$h]; ?>'; size='5' maxlength='6'></td>      </tr>    <?php  }  ?>  <tr>    <td>      <br>      <input type='submit' value='Step 4 >>'>    </td>  </tr>  </form>     </table>