ChatGPT: A plugin that allows users to check a box for each passing day, starting with January 1 and continuing for three months.

Here is a PHP and HTML solution for a reward schedule where a user can check a box for each passing day, starting with January 1 and continuing to January 31. When all boxes are checked, another table is shown with February 1, and so on for three months.

First, we can create a PHP function that generates the HTML for the reward schedule table for a given month. This function will take two arguments: the number of days in the month and an array of booleans that indicate which days have been checked.

Then, we can use this function to generate the HTML for the reward schedule for January, February, and March. We can store the checked days in separate arrays for each month.

Then, we can use JavaScript to show and hide the tables based on whether all of the boxes are checked in the previous month’s table. We can use the onchange event of the checkboxes to check if all of the boxes are checked, and if they are, we can show the next month’s table.

<?php
/*
 * Plugin Name: Reward Schedule
 * Plugin URI: 
 * Description: A plugin that allows users to check a box for each passing day, starting with January 1 and continuing for three months.
 * Version: 1.0
 * Author: 
 * Author URI: 
 * License: GPLv2 or later
 */

function createRewardScheduleTable($numDays, $checkedDays) {
  $html = '<table>';

  // Generate the table rows
  for ($i = 1; $i <= $numDays; $i++) {
    $html .= '<tr>';

    // Generate the table cells
    $html .= '<td>' . $i . '</td>';
    $html .= '<td><input type="checkbox" ' . ($checkedDays[$i] ? 'checked' : '') . '/></td>';

    $html .= '</tr>';
  }

  $html .= '</table>';
  return $html;
}

function outputRewardSchedule() {
  // Generate the HTML for the reward schedule tables
  $januaryCheckedDays = array_fill(1, 31, false);
  $februaryCheckedDays = array_fill(1, 28, false);
  $marchCheckedDays = array_fill(1, 31, false);

  $januaryHTML = createRewardScheduleTable(31, $januaryCheckedDays);
  $februaryHTML = createRewardScheduleTable(28, $februaryCheckedDays);
  $marchHTML = createRewardScheduleTable(31, $marchCheckedDays);

  // Output the tables to the page
  echo '<div id="january">' . $januaryHTML . '</div>';
  echo '<div id="february" style="display: none;">' . $februaryHTML . '</div>';
  echo '<div id="march" style="display: none;">' . $marchHTML . '</div>';

  // Add the JavaScript code that will show and hide the tables based on whether all of the boxes are checked in the previous month's table
  echo '<script>';
  echo 'function checkAllBoxesChecked(table) {';
  echo '  // Get all of the checkboxes in the table';
  echo '  var checkboxes = table.getElementsByTagName("input");';
  echo '';
  echo '  // Check if all of the checkboxes are checked';
  echo '  for (var i = 0; i < checkboxes.length; i++) {';
  echo '    if (!checkboxes[i].checked) {';
  echo '      return false;';
  echo '    }';
  echo '  }';
  echo '';
  echo '  return true;';
  echo '}';
  echo '';
  echo '// Show the next months table when all of the boxes are checked in the current months table';
  echo 'document.getElementById("january").onchange = function() {';
  echo '  if (checkAllBoxesChecked(this)) {';
  echo '    document.getElementById("february").style.display = "block";';
  echo '  }';
  echo '};';
  echo 'document.getElementById("february").onchange = function() {';
  echo '  if (checkAllBoxesChecked(this)) {';
  echo '    document.getElementById("march").style.display = "block";';
  echo '  }';
  echo '};';
  echo '</script>';
}

function reward_schedule_shortcode() {
  ob_start();
  outputRewardSchedule();
  return ob_get_clean();
}
add_shortcode('reward_schedule', 'reward_schedule_shortcode');

?>