/**

   * \brief

   *   Adds a section to this semester after finding the class.

   *

   * \return

   *   NULL on success, a string on error which is a message for the

   *   user and a valid XHTML fragment.

   */

    /* reject invalid times */

    if (!strcmp($time_start, 'none') || !strcmp($time_end, 'none')

	|| $time_start > $time_end)

      {

	return 'Invalid time specifications for ' . htmlentities($course_name) . '-' . htmlentities($letter)

	  . '. Start time: <tt>' . htmlentities($time_start) . '</tt>. End time: <tt>' . htmlentities($time_end) . '</tt>.';

      }

$fix_errors = FALSE;

elseif (!empty($_REQUEST['e']))

  {

    /*

     * Read an errorful schedule out of $_POST, this $_POST is created

     * by process.php when the originally sinful user produces bad

     * data.

     */

    $errors_fix = TRUE;

    $parent_schedule_id = (int)$_POST['postData']['parent_schedule_id'];

  }

elseif ($errors_fix)

  {

    foreach ($_POST['postData'] as $course)

      if (is_array($course))

	{

	  if (empty($course['name']))

	    $my_hc .= '    class_last = add_class();' . PHP_EOL;

	  else

	    $my_hc .= '    class_last = add_class_n(\'' . htmlentities($course['name'], ENT_QUOTES) . '\');' . PHP_EOL;

	  foreach ($course as $section)

	    if (is_array($section))

	      $my_hc .= '    add_section_n(class_last, \'' . htmlentities($section['letter'], ENT_QUOTES) . '\', \''

		. htmlentities($section['synonym'], ENT_QUOTES) . '\', \'' . htmlentities($section['start'], ENT_QUOTES) . '\', \''

		. htmlentities($section['end'], ENT_QUOTES) . '\', '

		. json_encode(array('m' => !empty($section['days'][0]), 't' => !empty($section['days'][1]), 'w' => !empty($section['days'][2]),

				    'h' => !empty($section['days'][3]), 'f' => !empty($section['days'][4]),

				    's' => !empty($section['days'][5])))

		. ', \'' . htmlentities($section['professor'], ENT_QUOTES) . '\', \''

		. htmlentities($section['location'], ENT_QUOTES) . '\', \''

		. htmlentities($section['type'], ENT_QUOTES) . '\');' . PHP_EOL;

	  $my_hc .= PHP_EOL;

	}

  }

<input

    id="scheduleName"

    style="margin-bottom: 1em;"

    class="defText required"

    type="text"

    size="25"

    title="<?php echo $inputPage->semester['name'] ?>"

    name="postData[name]"

    <?php

      if ($sch)

        echo 'value="' . htmlentities($sch->getName(), ENT_QUOTES) . '"';

      elseif ($errors_fix)

        echo 'value="' . htmlentities($_POST['postData']['name'], ENT_QUOTES) . '"';

    ?> />

/**

 * \brief

 *   Convert a multidimensional array to a set of <input />s.

 *

 * Currently just echos out the <input />s as they are created.

 *

 * \param $array

 *   The array to make into a set of <input />s.

 * \param $base

 *   The string to prefix. Normally the name of the array variable.

 * \param $blankness

 *   A string to insert at the beginning of each line before an <input

 *   /> for indentation's sake.

 */

function array_to_form($array, $base = '',  $blankness = '        ')

{

  foreach ($array as $key => $val)

    if (is_array($val))

      array_to_form($val, $base . '[' . $key . ']', $blankness);

    else

      echo $blankness . '<input name="' . htmlentities($base . '[' . $key . ']') . '" value="' . htmlentities($val) . '" type="hidden" />' . PHP_EOL;

}

	$errors = array();

					    $error_string = $allClasses->addSection($class['name'], $section['letter'], $section['start'], $section['end'], arrayToDays($section['days'], 'alpha'), $section['synonym'], $section['professor'], $section['location'], $section['type']);

					    if ($error_string !== NULL)

					      $errors[] = $error_string;

		/*

		 * Tell the user that his input is erroneous and

		 * require him to fix it.

		 */

		if (count($errors))

		  {

		    $error_page = new Page('Process Schedule — Errors');

		    echo '        <p>' . PHP_EOL

		      . '          You have the following errors in your input:' . PHP_EOL

		      . '        </p>' . PHP_EOL

		      . '        <ul>' . PHP_EOL;

		    foreach ($errors as $error)

		      echo '          <li>' . $error . '</li>' . PHP_EOL;

		    echo '        </ul>' . PHP_EOL

		      . '        <h3>Solving Errors</h3>' . PHP_EOL

		      . '        <ul>' . PHP_EOL

		      . '          <li>Most importantly, click the <em>Fix</em> button below to return to the schedule editing page to resolve these errors. Hitting your browser\'s <em>Back</em> button will cause your input to be lost.</li>' . PHP_EOL

		      . '          <li>Ensure that no section\'s start or end times are left blank. Any blank start or end times are shown as <tt>none</tt> in the above error output.</li>' . PHP_EOL

		      . '          <li>Ensure that a section\'s end time is later in the day than its start time.</li>' . PHP_EOL

		      . '          <li>If you are having trouble resolving these issues, please feel free to <a href="feedback.php">leave us feedback</a>. Be sure to describe your problem with as much detail as possible; otherwise we may only be able to make conjectures about the errors instead of finding and fixing any bugs. Thanks! <em>(To provide us with the most reliable data, save this webpage onto disk and paste the entire (X)HTML source into the feedback form.)</em></li>' . PHP_EOL

		      . '        </ul>' . PHP_EOL;

		    /* Regurgitate the postData into a <form /> */

		    echo '        <form action="input.php" method="post">' . PHP_EOL

		      . '          <input name="e" value="1" type="hidden" />' . PHP_EOL;

		    array_to_form($_POST['postData'], 'postData', '          ');

		    echo '          <button type="submit" class="gray">Fix Errors!</button>' . PHP_EOL

		      . '        </form>' . PHP_EOL;

		    $error_page->foot();

		    exit;

		  }