C:/xampp/htdocs/zen-cart/admin/includes/init_includes/init_html_editor.php

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<?php
if (!defined('DIR_WS_EDITORS')) define('DIR_WS_EDITORS', 'editors');
if (!defined('IS_ADMIN_FLAG')) {
  die('Illegal Access');
}
  $editors_list['NONE'] = array('desc' => EDITOR_NONE, 'handler' => '', 'special_needs' => ''); // plain text
  if (is_dir(DIR_FS_CATALOG . DIR_WS_EDITORS . 'htmlarea')) $editors_list['HTMLAREA']  = array('desc' => EDITOR_HTMLAREA,  'handler' => 'htmlarea.php',  'special_needs' => '');
  if (is_dir(DIR_FS_CATALOG . DIR_WS_EDITORS . 'ckeditor')) $editors_list['CKEDITOR']  = array('desc' => EDITOR_CKEDITOR,  'handler' => 'ckeditor.php',  'special_needs' => '');
  if (is_dir(DIR_FS_CATALOG . DIR_WS_EDITORS . 'tiny_mce')) $editors_list['TINYMCE']   = array('desc' => EDITOR_TINYMCE,   'handler' => 'tinymce.php',   'special_needs' => '');

  $editors_pulldown = array();
  $i = 0;
  foreach($editors_list as $key=>$value) {
          $i++;
    $editors_pulldown[] = array('id' => $i, 'text' => $value['desc'], 'key' => $key);
  }
  if (!isset($_SESSION['html_editor_preference_status'])) {
    $_SESSION['html_editor_preference_status'] = HTML_EDITOR_PREFERENCE;
  }
  $new_editor_choice = (isset($_GET['action']) && $_GET['action'] == 'set_editor' && isset($_GET['reset_editor'])) ? $_GET['reset_editor'] : -1;

  foreach($editors_pulldown as $key=>$value) {
    if ($new_editor_choice == $value['id']) $_SESSION['html_editor_preference_status'] = $value['key'];
    if ($_SESSION['html_editor_preference_status'] == $value['key']) $current_editor_key = $value['id'];
  }
  $editor_handler = DIR_WS_INCLUDES . $editors_list[$_SESSION['html_editor_preference_status']]['handler'];
  $editor_handler = ($editor_handler == DIR_WS_INCLUDES) ? '' : $editor_handler;
  /* if handler not found, reset to NONE */
  if ($editor_handler != '' && !file_exists($editor_handler)) {
    $editor_handler = '';
    $_SESSION['html_editor_preference_status'] = 'NONE';
    $current_editor_key = 0;
  }

if (false) {
  echo '<br /><pre>'; print_r($_GET); echo '</pre>';
  echo '<br />new_editor_choice = ' . $new_editor_choice;
  echo '<br />current_editor_key = ' . $current_editor_key;
  echo '<br />$_SESSION[html_editor_preference_status] = ' . $_SESSION['html_editor_preference_status'];
  echo '<br />editor_handler = ' . $editor_handler;
  echo '<br /><pre>'; print_r($editors_list); echo '</pre>';
  echo '<br /><pre>'; print_r($editors_pulldown); echo '</pre>';
  //die('debug end');
}